Birth Registry Research Articles

Pregnancy complications and long-term risk of cardiovascular events in women with heart disease

Abstract Background/Introduction Women with congenital heart or acquired heart disease are at increased risk of atherosclerotic cardiovascular disease. Pregnancy complications are established risk factors for cardiovascular disease in the general population, but their prognostic value for cardiovascular outcomes in the population with congenital or acquired heart disease is unknown. Purpose To determine the frequency and prognostic value of pregnancy complications for the risk of cardiovascular outcomes in women with congenital or acquired heart disease. Methods This nationwide registry-based cohort study included women in Sweden with heart disease (pulmonary arterial hypertension, congenital heart disease or acquired valvular heart disease) with singleton births registered in the national Medical Birth Register between 1973 and 2014. Exposures of pregnancy complications (preeclampsia/gestational hypertension, preterm birth or birth of an infant small for gestational age) were collected from the Medical Birth Register, and cardiovascular outcomes (mortality and hospitalizations) from the Cause of Death Register and the National Inpatient Register. Cox regression models were performed with time-dependent covariates, to determine the possible prognostic value of the studied pregnancy complications for cardiovascular outcomes including atherosclerotic cardiovascular disease, heart failure and arrythmias after adjustment for major confounding including smoking and body mass index. Results Among the total of 2,134,239 women included from the Medical Birth Register, 2,554 women with 5,568 singleton births were affected by heart disease. Preeclampsia/gestational hypertension affected 5.8% of pregnancies, preterm birth 9.7%, and birth of an infant small for gestational age 2.8%. Preterm birth (adjusted HR 1.91 (95% CI 1.38-2.64)) was associated with an increased risk of maternal all-cause mortality. Preeclampsia/gestational hypertension (adjusted HR 1.64 (95% CI 1.18-2.29)) and preterm birth (adjusted HR 1.56 (95% CI 1.19-2.04)) were associated with an increased risk of hospitalizations for atherosclerotic cardiovascular disease. Conclusions Pregnancy complications were frequent in women with congenital or acquired heart disease. With a median follow-up time of 22 years, preterm birth was associated with a higher risk of cardiovascular mortality, and preeclampsia/gestational hypertension and preterm birth were associated with cardiovascular morbidity. In women with heart disease, pregnancy complications may provide additional information for the risk assessment of future cardiovascular outcomes.Overview of study designPrevalence and risk estimation

Anemia in pregnancy and adverse maternal health outcomes - birth-registry based study from Georgia

Abstract Anemia in pregnancy is an important public health challenge; however, it has not been thoroughly studied in Georgia. We assessed the prevalence of anemia during pregnancy across Georgia and the association between anemia in the third trimester of pregnancy and adverse maternal outcomes. We used data from the Georgian Birth Registry and included pregnant women who delivered between January 1, 2019, and August 31, 2022 (n = 158,668). The prevalence of anemia (hemoglobin (Hb) < 110 g/L) at any time during pregnancy was calculated per region. Women in the third trimester were classified into three groups, based on their lowest measured Hb value: no (Hb ≥ 110 g/L, reference group); mild (Hb 100-109 g/L); and moderate to severe anemia (Hb < 99 g/L). Adjusted odds ratios (aOR) with 95% confidence intervals (CIs) were calculated for the associations between anemia status and post-delivery intensive care unit (ICU) admission and preterm delivery. The prevalence of anemia occurring at least once during pregnancy was 40.6%, with large regional differences in anemia prevalence (25.1%-47.0%). Of 105,811 pregnant women with Hb measurements in the third trimester, 71.0% had no anemia; 20.9%, mild anemia; and 8.1%, moderate or severe anemia. The odds of post-delivery ICU admission did not increase linearly with decreasing Hb value (P for trend .13), and the relationship was inverse for preterm delivery (P for trend .01). Key messages • A considerable proportion of pregnant women in Georgia have anemia during pregnancy, and the prevalence and quality of reporting differ across regions. • To accelerate national progress toward the SDGs and mitigate the consequences of anemia, equal countrywide access to high-quality ANC programs and complete registration of Hb values should be ensured.

Use of specialist health care among Norwegian-born children with one immigrant parent

Abstract Background An increasing number of children grow up with one immigrant and one native born parent. We know little about health in this group. Our aim was to compare the risk of receiving diagnoses of physical health conditions in specialist health care among Norwegian-born children with one immigrant parent compared to Norwegian background children. Methods Data from Medical Birth Registry of Norway were linked to data from the Norwegian Patient Registry (diagnoses in specialist health care), and Statistics Norway (parental country of origin, education, and household income). We estimated hazard ratios (HR) with Cox proportional hazard regressions, with Norwegian background children as reference category, adjusted for sex, birth year, parental education, and household income. Results Children with an immigrant parent had lower hazards than Norwegian background children of diagnoses of most types of infections, but higher hazards of some, including tuberculosis, and skin infections. They also had higher hazards than Norwegian background children of receiving diagnoses of obesity and other nutritional deficiencies, and skin diseases, but lower hazards for other conditions, including chronic lower respiratory disease, disease of the digestive system, and visual or hearing impairment. The hazards of diagnoses of any neurological condition, sleeping disorders and epilepsy were lower among children with an immigrant mother, but higher among those with an immigrant father. Differences between children with one immigrant parent and Norwegian background could not be explained by differences in parental education or household income. Conclusions Children of one immigrant parent do not overall use specialist health care for physical health issues more than other children. Key messages • Awareness of diagnoses given most frequently to children of one immigrant parent can help promote timely diagnoses and adequate use of services, which is important for prevention of later illness. • Barriers to health care use among children of immigrants should be further researched.

Maternal education and antenatal attendance in Georgia: A cohort study

Abstract Background Antenatal care (ANC) and maternal education are important determinants for maternal and newborn health outcomes. Understanding the impact of maternal education on ANC is crucial. Purpose To examine the association between maternal education and ANC attendance. Methods A retrospective cohort study utilized nationwide electronic medical birth registry data (2020-2022) in Georgia. the study includes pregnant women and their newborns. A randomized sample was selected, and extracted variables included maternal age, parity, body mass index, education, year of delivery, gestational age, infant sex, Apgar score, birth weight, delivery type, and newborn status. Statistical analysis via IBM SPSS v23 involved chi-square, t-tests, and logistic regression. Results The sample size contains 4976 mothers after excluding cases with missing data (n = 25). The mean maternal age was 30.5 years (SD = 5.4), with a mean BMI of 28.0(SD = 4.8), and the mean gestational week was 38.4(SD = 2.0), with a mean birth weight of 3263.0 (SD = 568.0) grams. Highly educated women had more than 3 times higher odds (OR = 3.636,95%CI:2.575-5.134) of having at least one ANC visit compared to those with Unknown education. primiparous women had significantly higher odds of having at least one ANC visit compared to Multiparous women, OR = 1.519, (95%CI:1.081-2.135). The chi-square test showed significant difference between ANC visits and the number of liveborn/stillborn (χ² = 53.026, p < .001). Moreover, there was a significant association between birth weight categories and ANC visits (χ² = 167.095, p < .001). Conclusions Our study emphasizes the role of education in improving access to ANC among women with low education levels. We can increase ANC visits and improve maternal and newborn health outcomes by focusing educational efforts on pregnant women. Additionally, focusing on high-risk populations, and using tailored interventions can further improve ANC attendance along with maternal and neonatal health. Key messages • Boosting ANC access and improving maternal and neonatal health by tailored community programs. • Conservative communities and underrepresented communities require additional resources to promote tailored healthcare. and extra effort in education about ANC.

Diagnoses of mental health disorders among Norwegian youth and young adults with immigrant parents

Abstract Introduction Adolescence and early adulthood are associated with an increase in mental health problems. Migration is also a risk factor for mental disorders. Yet, there is a notable gap in research concerning the mental well-being of descendants of immigrants. This study investigates the risk of a diagnosis of a mental health disorder among those aged 16-30 years, born in Norway with at least one immigrant parent. Methods Data were sourced from the Medical Birth Registry of Norway, the Norwegian Patient Register, and Statistics Norway. Cox proportional hazard regressions were used to estimate hazard ratios (HR) of being diagnosed with different mental disorders, in total and by parental region of origin, compared to individuals of Norwegian background. Analyses were adjusted for sex, year of birth, and parental education. Results Individuals with two immigrant parents had a lower risk of most mental disorder diagnoses, while those of one immigrant parent had a higher risk. With the exception of schizophrenia, individuals with two immigrant parents had a lower risk of most mental disorder diagnoses compared to those with Norwegian-born parents. The HR for the risk of a diagnosis of anxiety for those with two immigrant parents was: 0.79 [95% CI 0.76 - 0.81], with immigrant mother: 1.07 [95% CI 1.04-1.10], with immigrant father: 1.28 [95% CI 1.24 -1.30]. Similarly, for depression, two immigrant parents: 0.85 [95% CI 0.82-0.88], immigrant mother: 1.13 [95% CI 1.09 - 1.17], immigrant father: 1.31 (95% CI 1.28-1.37). Bipolar disorders, two immigrant parents: 0.67 [95% CI 0.60-0.76], immigrant mother: 1.19 [95% CI 1.07 - 1.31], immigrant father: 1.47 [95% CI 1.35-1.61]. The pattern was relatively consistent across parental regions of origin. Conclusions Those with one immigrant parent are more likely to use specialist mental health services, while those with two immigrant parents are not. These need special attention in adulthood. Key messages • Differences in risk of diagnosis for mental disorders could be due to differences in the utilization of mental health services. • Early prevention of mental health issues seems to be especially important among children and youth raised in families with one immigrant parent.

Maternal pre-gestational and gestational diabetes and risk of offspring epilepsy: A cohort study

Abstract Background Despite growing evidence linking maternal diabetes to impaired brain physiology and neurodevelopment in offspring, evidence on its effect on epilepsy remains scarce. This study aims to determine if intrauterine exposure to maternal pre-existing and gestational diabetes mellitus is associated with risk of offspring epilepsy. Methods We studied >2.3 million singletons live-born in Sweden between 1998 and 2021, with final follow up until October 31, 2023. The Swedish Medical Birth Register was linked to the National Patient Register to identify gestational diabetes (GDM), maternal pre-gestational type 1 (T1DM) and type 2 diabetes (T2DM), and offspring epilepsy. The incidence of epilepsy, comparing offspring of mothers with versus without diabetes, was calculated as hazard ratios (HR), adjusting for maternal education, smoking, body mass index, hypertension, epilepsy and other important confounders. Paternal T1DM and T2DM were additionally analysed as negative control exposures to assess genetic confounding. Results Of the 2,335,245 offspring analysed (48.9% female), 13,883 (0.6%) were exposed to maternal T1DM, 4477 (0.2%) to T2DM, and 37,253 (1.6%) to GDM. During a median follow up of 13 years (range 0-26 years), 18,732 offspring were diagnosed with epilepsy. Maternal T1DM (HR 1.27, 95% confidence intervals [CI] 1.08-1.49) and T2DM (HR 1.34, 95% CI 1.00-1.49) were associated with higher hazards of epilepsy in offspring, compared with no exposure to maternal diabetes. Preterm birth and birth-asphyxia jointly mediated 63% and 39% of these associations, respectively. No association was found between maternal GDM and epilepsy. Paternal T1DM and T2DM did not show association with epilepsy. Conclusions In this nationwide population-based cohort study, children of mothers with T1DM or T2DM showed an elevated risk of epilepsy. The results from paternal comparison and mediation analyses suggest a key role of the intrauterine environment in the aetiology of epilepsy. Key messages • Maternal pre-existing T1DM and T2DM might be risk factors for epilepsy in offspring and are likely to influence the risk through the intrauterine environment independent of genetic mechanisms. • In the context of a globally rising prevalence of diabetes in women who get pregnant, it is crucial that the diabetes is well-regulated and birth complications associated with diabetes are prevented.

Long-term outcomes in women diagnosed with heart failure in connection to delivery

Abstract Background Heart failure (HF) among young patients may be from various causes, often triggered by heightened physical demands like pregnancy. Data regarding outcomes of women diagnosed with HF in conjunction to pregnancy and delivery are varied. There remains a notable gap in understanding the outcomes observed in women diagnosed with heart failure in conjunction with delivery. Also, long-term follow-up studies are crucial to elucidate the impact of pregnancy-associated HF on future cardiovascular. Purpose To study the interplay between pregnancy, HF, and subsequent cardiovascular risk. Method Using the personal identification numbers (PINs) that all individuals in Sweden have enables linkage of data between different registers. Data from the National Patient Register (NPR), Swedish Medical Birth Register (MBR) and the Cause of Death Register were also used. All women 18 to 50 years of age registered in the in MBR in the period 1st January 1997 to 31st December 2019 were included. Women with first-time HF in relation to delivery were identified using the international classification code for diseases (ICD-10) I50, I42, I43 and 090.3 together with co-morbidities. Every patient was compared with 5 controls without HF from the Total Population Register matched on age at delivery and calendar year of delivery. Outcomes: all-cause mortality, and any cardiovascular disease (CVD) diagnosed during the observation time. Results A total of 286 cases and 1,430 controls were included. The prevalence of comorbidities at baseline for both patients and controls was low; congenital heart disease (1.4%, vs. 0%), pulmonary hypertension (1.0% vs. 0%), valvular heart disease (5.9% vs. 0%), myocardial infarction 0.7% vs. 0%), arrhythmia (5.9% vs. 0%), hypertension (6.3 % vs. 0.1%), (all p<0.05). Preeclampsia prior to HF diagnosis had 31% of patients vs. 0.2% of controls (p<0.001). Patients exhibited higher mortality rates at 4.9% during median follow up 9.0 (IQR 5.6-13.0) years vs. 0.3%, median follow up 9.4 (6.2-13.5) years and hazard ratios (HR) for all-cause mortality HR (95% CI) of 18.20 (5.99 - 55.31) (p<0.001) compared to controls. During median follow up of 3.2 (0.0-9.2) years 60.1% of patients were diagnosed with CVD both at in-/out-patient settings compared with 4.1% in controls during 9.4 (5.8-13.5) years of follow up. Comparing patients with controls the HR (95% CI) was 22.24 (16.50 - 29.96) p<0.0001 for CVD diagnosis during follow-up, see Figure 1. Conclusion In conjunction with delivery, and in the years thereafter, women with heart failure diagnosis had more than eighteen times higher risk of mortality than women without heart failure. The risk of CVD event in the heart failure group is highest in conjunction with delivery. Figure 1. Cumulative incidence functions for all-cause mortality, CVD in- or out-patient visit adjusted for death as competing risk, comparing cases with controls.

Delivery mode and subsequent birth rate: A nationwide register-based analysis in Finland.

The study aimed to calculate the subsequent birth rate for different delivery modes, comparing them with spontaneous vaginal deliveries, using a comprehensive nationwide high-quality registry. Data from the National Medical Birth Register (MBR) were used to evaluate the birth rate after different delivery modes. All first deliveries for a mother during the years 2004 to 2016 were included. For these women, all second pregnancies from the MBR during the years 2004 to 2018 were retrieved and combined with the data of the first deliveries. A Cox regression model was used to evaluate the risk for the second pregnancy after giving birth the first time. The results were interpreted with adjusted hazard ratios (aHRs) and 95% confidence intervals (CIs). A total of 375 619 women with a first and second pregnancy leading to birth were included in this study. Of these, a total of 50 579 women underwent assisted vaginal delivery, 50 429 had an unplanned cesarean section (CS), 22 021 had elective CS, and 252 593 had spontaneous vaginal delivery as a mode of delivery in their first pregnancy. Women with assisted vaginal delivery (aHR, 1.23 [CI, 1.21-1.24]) and unplanned CS (aHR, 1.03 [CI, 1.02-1.05]) had higher birth rates after the first birth, and women with elective CS as a mode of delivery had lower birth rates (aHR, 0.86 [CI, 0.84-0.88]) when compared with women who had spontaneous vaginal delivery. The findings of this study indicate that the CS operation itself is not the only cause of the observed lower birth rate; rather, there are underlying factors that have a greater impact on birth rates.

Associations between term cesarean delivery in the first pregnancy and second-pregnancy preterm delivery.

Cesarean delivery has been shown to increase the risk of preterm delivery in future pregnancies. The association could be a direct result of the procedure, or because the indications that led to the cesarean delivery also increase the risk of preterm delivery in later pregnancies. 298 901 mothers with first and second singleton deliveries from 1999 to 2020 were investigated using data from the Medical Birth Registry of Norway linked with Statistics Norway. The mothers were categorized by mode of cesarean delivery (total, emergency and planned) and vaginal delivery at term in the first pregnancy. We used log-binomial regression models to estimate relative risks with 95% confidence intervals (CI) of iatrogenic and spontaneous preterm delivery <37 gestational weeks in the second pregnancy. Second, we explored the role of recurrent placental disease in preterm delivery by comparing estimates in mothers with placental disease in neither or both pregnancies. 8243 mothers (2.8%) had a preterm delivery in the second pregnancy. The adjusted relative risk (aRR) of preterm delivery was 1.24 (95% CI 1.17-1.32) after cesarean compared with vaginal delivery in the first pregnancy. The association was stronger in previous planned compared with emergency cesarean delivery (aRR 1.52, 95% CI 1.30-1.77 and aRR 1.21, 95% CI 1.14-1.29, respectively). Spontaneous preterm delivery was not associated with the previous mode of delivery; the risk was confined to iatrogenic preterm delivery after both emergency and planned cesarean delivery (aRR 1.69, 95% CI 1.52-1.87 and aRR 2.65, 95% CI 2.12-3.30, respectively). Mothers with placental disease in both pregnancies had a sixfold increased risk of preterm delivery in the second pregnancy compared with mothers with no placental disease, however, the association between mode of delivery and subsequent preterm delivery was similar in mothers with and without placental disease in the pregnancies. Compared with vaginal term delivery in the first pregnancy, cesarean delivery increases the risk of iatrogenic, but not spontaneous preterm delivery in the next pregnancy. Although strongly associated with preterm delivery, placental disease had limited influence on the estimates.

Cardiovascular disease in pregnancy: Prevalence and obstetric outcomes in a Swedish population-based cohort study between 2000 and 2019.

The prevalence of cardiovascular disease during pregnancy (cardiovascular disease diagnosed before, during or up to 6 months after childbirth) and the risk of adverse outcomes associated with it have not been previously described in Sweden. This study examined trends in prevalence of cardiovascular disease and its association with maternal and perinatal outcomes, overall and by timing of diagnosis in relation to pregnancy. This population-based observational retrospective cohort study consisted of women aged 15-49 years who were registered in the Swedish Medical Birth Register 2000-2019. Prevalence was defined as annual diagnosis of cardiovascular disease per pregnant woman as numerator and all pregnant women per year as denominator. Adverse maternal and perinatal outcomes were analyzed using time-dependent Cox regression and Poisson regression models. Outcomes were obtained during and after childbirth up to 1 year postpartum, depending on the outcome. There were 2 069 107 births to 1 186 137 women (911 101 primiparous). The prevalence of cardiovascular disease among pregnant women in Sweden during 2000-2019 increased from 0.31% to 1.34%, for non-congenital cardiovascular disease, this was primarily driven by arrythmia (0.11%-0.58%). Primiparous women with cardiovascular disease had a higher risk of eclampsia over-all (aHR 4.50, 95% CI 2.01-10.05) and when diagnosed during pregnancy (aHR 3.22, 95% CI 1.21-8.61); admission to psychiatric ward overall (aHR 2.51, 95% CI 1.30-4.83), and when diagnosed during pregnancy (aHR 2.54, 95% CI 1.21-5.34); and one-year mortality when diagnosed before pregnancy (aHR 1.67, 95% CI 1.16-2.42) and when diagnosed postpartum (aHR 6.59, 95% CI 3.38-12.84), compared to those without cardiovascular disease. Children born to women with cardiovascular disease diagnosed both overall and in relation to timing of diagnosis had an increased risk of being born preterm and small for gestational age. Cardiovascular disease prevalence among pregnant women in Sweden increased during 2000-2019, primarily driven by arrhythmias. In primiparous women, the timing of diagnosis of cardiovascular disease is important for maternal and perinatal outcomes, including when diagnosed postpartum. This calls for awareness among all staff when planning pregnancy and monitoring women with cardiovascular disease throughout pregnancy and in the postpartum period.

Unsupervised approach to text line extraction in Belfort civil registers of births

Unsupervised approach to text line extraction in Belfort civil registers of births

64 Respiratory outcomes by five years of age among children born preterm: A population-based study using health services data

Abstract Background While neonatal care advancements have led to increased survival of preterm infants, many experience ongoing respiratory complications. Objectives Healthcare administrative data offers a comprehensive measure of neonatal outcomes. Our study used population-based data to describe rates of healthcare contacts for respiratory disease among children born preterm. Design/Methods A retrospective cohort of infants born in British Columbia between 2004-2014 was identified using a provincial birth registry. By linking to population-based healthcare data, we captured population demographics, birth data, and healthcare visits for respiratory causes [outpatient visits, hospitalizations, and intensive care (ICU) admissions] up to 5 years of age. The rate of healthcare visits due to asthma, bronchiolitis, and pneumonia were compared between preterm (22-36 weeks) and term/post-date infants (37-44 weeks GA) using Poisson regression. Results Children born at term (n=413,140) were compared to children born at 34-36 week GA (n=33,227), 28-33 week GA (n=8362), and 22-27 week GA (n=1231). Compared to term infants, rates of hospitalizations and ICU admission for all respiratory causes were higher among children born preterm. Children born 22-27 weeks GA had the highest rates of hospitalization for asthma [rate ratio (RR) 9.4, 95% CI 7.9-11.1], bronchiolitis (RR 10.5, 95% CI 9.3-11.8) and pneumonia (RR 15.9, 95% CI 14.3-17.7). Rates of ICU admission for asthma (RR 27.1, 95% CI 17.2-40.4) and pneumonia (RR 58.1, 95% CI 46.6-71.7) were highest among 22-27 week GA infants. Increased rates persist among children born 34-36 weeks GA, with higher rates of hospitalization for asthma (RR 1.8, 95% CI 1.6-1.9), bronchiolitis (RR 2.1, 95% CI 2.0-2.2), and pneumonia (RR 1.8, 95% CI 1.7-2.0) compared to term infants. Conclusion Preterm infants experience significantly higher rates of outpatient visits, hospitalizations, and ICU admissions for respiratory disease compared to term infants. Healthcare utilization, including ICU admissions, increased with decreasing gestational age. Of note, increased rates of respiratory disease were also found among infants born 34-36 weeks GA. Our study is the first to use population based data to describe rates of healthcare contacts for respiratory disease among preterm infants, providing insight to long-term respiratory disease burden.

Pregnancy-Associated Maternal Mortality Within One Year After Childbirth: Population-Based Cohort Study.

The objective of this study is to assess associations between pregnancy complications and pregnancy-associated maternal mortality (PAM) within 1 year after childbirth. Population-based cohort study. Norway, 1967-2020. 1 237 254 mothers with one or more singleton pregnancies registered in the Medical Birth Registry, 1967-2019 and followed in the Cause of Death Registry to 2020. Logistic regression was used to calculate odds ratios (ORs) with 95% confidence intervals (CIs), adjusted for maternal education, age, year of first childbirth and chronic medical conditions. PAM by lifetime history of pregnancy complications: placental abruption, preeclampsia, preterm birth, perinatal death, small for gestational age (< 2.5 percentile), gestational diabetes and gestational hypertension. Crude OR for PAM was 4.24 (95% CI 3.53-5.10), if complications occurred in the last pregnancy, whereas 2.52 (2.08-3.06) if complications occurred in the first pregnancy, compared to mothers without complications in any pregnancy. Adjusted ORs for PAM when complications occurred in the last pregnancy were, for placental abruption 3.75 (1.20-11.72), preeclampsia: 4.42 (3.17-6.15), preterm birth: 4.32 (3.25-5.75), perinatal death: 24.18 (16.66-35.08), small for gestational age: 2.90 (1.85-4.54), gestational diabetes: 1.43 (0.63-3.25) and pregnancy hypertension: 2.05 (1.12-3.74) compared to mothers without complications. The OR for PAM increased slightly by increasing the number of complicated pregnancies but the trend was stronger for increasing number of complications in the last pregnancy (e.g., during 1999-2019: one complication; 4.14 [2.79-6.13], two complications; 11.50 [6.81-19.43]). Complications in the last pregnancy were more strongly associated with PAM than those in the first pregnancy.

Validity of self-reported number of pregnancies and maternal age at first birth among females attending organized mammographic screening.

Reproductive history conveys information about potential health risks later in adulthood. This study aimed to examine the validity of self-reported number of pregnancies and maternal age at first birth (AFB) among females attending BreastScreen Norway. Participants were identified through the Janus Serum Bank cohort in Norway and were eligible for this cross-sectional validation study if they participated in a health survey issued by BreastScreen Norway between 2006 and 2015. Retrospective self-reported survey information on number of pregnancies and AFB in years was validated against prospectively collected information from the Medical Birth Registry of Norway (MBRN) using the Spearman rank (rs) and intraclass correlation coefficients (ICC) with 95% confidence intervals (CI). After exclusions, 51,598 subjects were included in the analysis on number of pregnancies and 46,919 in the analysis on AFB. On average, study subjects were 59-60 years old when completing the health survey and had become first-time mothers roughly 36 years earlier. Survey-based information about number of pregnancies was highly correlated and demonstrated high agreement with the registry data (rs=0.967, 95% CI 0.964-0.969; ICC=0.884, 95% CI 0.882-0.885). Survey-based information about AFB demonstrated even higher correlation and very high agreement with the registry data (rs=0.975, 95% CI 0.973-0.976; ICC=0.974, 95% CI 0.974-0.975). Retrospectively recalled survey-based information about number of pregnancies and AFB was highly accurate when validated against prospectively collected information in the MBRN. These survey-based data are valuable for future epidemiological research, and linkage to the MBRN may not be required when these data are available.

Organic food consumption during pregnancy and symptoms of neurodevelopmental disorders at 8 years of age in the offspring: the Norwegian Mother, Father and Child Cohort Study (MoBa)

BackgroundPartially driven by public concerns about modern food production practices, organic food has gained popularity among consumers. However, the impact of organic food consumption during pregnancy on offspring health is scarcely studied. We aimed to investigate the association between maternal intake of organic food during pregnancy and symptoms of attention deficit/hyperactivity disorder (ADHD) and autism spectrum disorder (ASD) in offspring at 8 years of age.MethodsThis study was based on the Norwegian Mother, Father and Child Cohort Study (MoBa) and the Medical Birth Registry of Norway (MBRN). The total study sample included 40,707 mother–child pairs (children born 2002–2009). Organic food consumption during pregnancy was assessed by six questions from a food frequency questionnaire in mid-pregnancy (sum score 0–18). Symptoms of ADHD and ASD in the offspring aged 8 years were measured by ADHD (0–54) and ASD (0–39) symptom scores based on the Parent/Teacher Rating Scale for Disruptive Behaviour disorders and the Social Communication Questionnaire. Associations between maternal intake of organic food during pregnancy and symptoms of ADHD and ASD in the offspring were analyzed using regression models with adjustment for covariates such as maternal anxiety and depression, including sibling analysis.ResultsMean ADHD and ASD symptom scores in the offspring differed only slightly by maternal intake of organic food. The covariate-adjusted unstandardized regression coefficient (adjusted(Adj)beta) with 95% confidence interval for the ADHD symptom score with one unit increase in organic food sum score was 0.03 (0.01, 0.05). Similarly, Adjbeta for autism symptom score was 0.07 (0.04, 0.10). For ADHD, the adjusted estimates weakened when adjusting for maternal symptoms of ADHD. The sibling analyses showed no significant results with Adjbeta − 0.07 (− 0.15, 0.01) and − 0.001 (− 0.12, 0.12) for ADHD and ASD outcomes, respectively.ConclusionsWe observed weak positive associations between frequent maternal organic food consumption during pregnancy and offspring ADHD and ASD symptom levels at 8 years of age. This trend weakened or disappeared after adjusting for maternal symptoms of ADHD, and in sibling analyses, suggesting that the associations mainly reflect genetic confounding. Our study indicates that consumption of organic food during pregnancy should neither be considered a risk factor nor protective against symptoms of ADHD and ASD in offspring.

Caesarean section and operative vaginal delivery in Estonia and Finland from 1992 to 2016: registry-based study.

Proportion of normal deliveries is decreasing worldwide. This study analysed operative vaginal deliveries (OVD) and Caesarean sections (CS) with some background factors in Estonia and Finland from 1992 to 2016. Data on all deliveries from 1992 to 2016 were obtained from the Finnish Medical Birth Registry (1 481 160 births) and the Estonian Medical Birth Registry (356 063 births). Time trends were analysed by joinpoint regression, and factors associated with OVD and CS by logistic regression. Odds ratios with 95% CIs were calculated, adjusted for year, maternal age, foetal birthweight, and use of epidural/spinal anaesthesia. One out of four deliveries were operative in Estonia and in Finland by 2016. By 2016, the Estonian CS rate had tripled to 20.9% and the OVD rate had increased by nine times to 5.6%. In Finland, the CS rate increased slightly to 16.4% while the OVD rate nearly doubled to 9.4%. In Estonia, the incidence of OVD was 24% lower (aOR 0.76, 95% Cl 0.74-0.78) and the incidence of CS 9% higher (aOR 1.09, 95% Cl 1.07-1.10) than in Finland. Use of epidural/spinal anaesthesia and foetal birthweight increased the risk of OVD in both countries, maternal age increased the risk of CS in both countries. Even if the CS and OVD rates are different, operative delivery rates may be similar in different countries. Combined analysis of operative deliveries together with background factors gives a better understanding of the trends in birthcare than monitoring CS rates alone.

Neighborhood Disadvantage and Birth Outcomes Among Refugees.

To examine the association between neighborhood socioeconomic disadvantage and birth outcomes among refugee women in Denmark, leveraging a natural experiment. This register-based study included 15 118 infants born to women who arrived in Denmark as refugees during 1986 to 1998, when a dispersal policy was in place that quasirandomly assigned newcomers to neighborhoods with varying degrees of socioeconomic disadvantage. Neighborhood disadvantage was measured using a composite index representing neighborhood-level income, education, unemployment, and welfare assistance. These data were linked to individual-level birth register data. Outcomes included low birth weight, preterm birth, and small-for-gestational-age infants. Associations between neighborhood disadvantage at resettlement and birth outcomes up to 20 years after resettlement were examined using multivariable regressions adjusting for characteristics of the women at resettlement. Each SD of increase in neighborhood disadvantage was associated with an 18% increase in low birth weight risk (0.61 percentage points [pp], 95% confidence interval [CI]: 0.19-1.02), 15% increase in preterm birth risk (0.64 pp, 95% CI: 0.22-1.07), and 7% increase in small-for-gestational-age risk (0.78 pp, 95% CI: 0.01-1.54) 5 years after resettlement. Results did not differ after adjusting for urbanicity and conational density, but associations were attenuated after adjusting for municipality-level fixed effects, suggesting that local government characteristics may partially explain the associations. Resettling in a disadvantaged neighborhood is associated with higher risk of adverse birth outcomes among refugee women. This highlights how policy decisions affecting settlement of refugees can have long-term consequences, including on the health of the next generation.

Association of housing tenure and unaffordable housing with preterm birth and other adverse birth outcomes in Canada: a population-based study

BackgroundSocioeconomic risk factors are known drivers of adverse birth outcomes. Housing is a key target for policy interventions.ObjectiveTo estimate the associations of housing tenure (renting vs owning) and unaffordable housing...

An assessment of the coverage of live-birth registration across space in Nigeria

ABSTRACT Birth registration is an important channel that allows children to be documented, providing them with legal identity and nationality early in life and protecting them against violence, abuse and exploitation. However, this privilege has been denied to millions of children, particularly in developing countries. Registration is limited in Nigeria with about three in every five births unregistered. Using data from three waves of the Nigeria Demographic and Health Survey, we adopt a geostatistical model to assess the space-time variations in registration coverage across Nigeria and compute the exceedance maps at different probabilities. The findings indicate a North-South divide in coverage but with improved coverage over time across the country. The probability of attaining about 60% coverage is low in the northern part of the country. The generated maps provide guiding tools to the Nigerian government to set priorities in order to scale up birth registration coverage in the country.

Association Between Body Mass Index and Risk of Aortic Stenosis in Women in the Swedish Medical Birth Registry.

Overweight and obesity are increasing globally with aging, as are life expectancy and aging-associated disorders, including calcific aortic stenosis (AS). Studies investigating the correlation between high body mass index (BMI) and AS are contradictory and inconclusive. This study examines a potential association between BMI and AS in women. By linking the Swedish Medical Birth Register and the Swedish National Patient Register, we included women aged 18 to 55 years with a first childbirth from 1981 to 2020. Diagnosis of AS and comorbidities were defined according to the International Classification of Diseases (ICD) codes. The women were divided into groups on the basis of BMI. Cox proportional hazards regression models were used to investigate the difference in the risk of being diagnosed with AS, with reference BMI 20 to <22.5 kg/m2. Among the 1 722 625 included women, the mean age was 28 years, and mean BMI was 24 kg/m2, with 21% being overweight (BMI 25 to <30 kg/m2) and 8.5% obese (BMI ≥30 kg/m2). During median follow-up of 19.5 years, 2488 women (0.14%) were diagnosed with AS. The age-adjusted risk of being diagnosed with AS increased with higher BMI to 2.82 (95% CI, 2.44-3.25) times higher in women with BMI 30 to <35 kg/m2, and to 3.72 (95% CI, 2.95-4.70) times higher in those with BMI ≥35 kg/m2. Similar results were found after excluding AS of rheumatic pathogenesis. An increase in BMI from its upper normal range was consistently and independently associated with the risk of developing AS in women.