Nationwide Register-based Cohort Study Research Articles

Patients' use of Danish emergency medical services before and during the COVID-19 pandemic: a register-based study

BackgroundDuring the COVID-19 pandemic, disturbing images of ambulances unable to respond to the demands for prehospital assistance appeared from several parts of the world. In Denmark, however, a notion occurred that the demands for emergency medical assistance declined. The purpose of this study was to compare the patients' use of the Danish Emergency Medical Services (EMS) before and during the COVID-19 pandemic. Furthermore, we investigated the overall mortality of the ambulance population, the main reason for calling the emergency medical dispatch centre, and the diagnosis assigned to the admitted patients.MethodsThe study was a nationwide registry-based cohort study based on the national prehospital medical records and the Danish National Patient Registry. The primary outcome was the requested number of ambulances. Secondary outcomes included the primary reason for contact with the dispatch centre (reflected by the dispatch criteria), patient mortality, and the diagnoses assigned to the patients transported to the hospital by ambulance during the COVID-19 pandemic in Denmark in March–December 2020. Comparisons were made using a similar period in 2019 before the pandemic.ResultsIn comparison with the baseline values before the pandemic, the total number of patients treated by the EMS was reduced by 4.5% during the COVID-19 pandemic. The number of patients transported to the hospital during the pandemic was similarly reduced by 3.5%. Compared with baseline values, fewer were patients hospitalised with respiratory diseases during the pandemic (a reduction of 53.3% from April 2019 to April 2020).Compared to the baseline period, there were significant increases in both the 48-h mortality (from 1.4% to 1.5%) and the 30-day mortality (from 4.9% to 5.4%) (p < 0.03 and p < 0.001, respectively), in patients hospitalised during the pandemic.ConclusionDuring the first wave of the COVID-19 pandemic, the Danish EMS experienced an overall reduction in the requests for and the use of ambulances and, especially, in the number of patients admitted to hospitals for respiratory diseases. Despite the overall reduction in EMS requests, the mortality of the ambulance population increased, indicating that despite the reduced ambulance use, the prehospital population was more severely ill during the pandemic.

Educational, labour market and relationship outcomes in people with acne.

Although acne is associated with scarring, mental health comorbidities and bullying, little is known about its impact on socio-economic outcomes. To examine the association between acne and educational, labour market and relationship outcomes. We conducted a nationwide registry-based cohort study in Denmark. We included birth cohorts from 1982 to 1988 and compared those with and without acne identified using hospital diagnosis codes and redeemed prescriptions. Our main educational outcome was educational attainment. The main labour market outcomes were earned income at age 30 and long-term unemployment at any time before age 30. The main relationship outcomes were single partnership and childlessness by age 30. Outcomes were assessed using Poisson regression for binary outcomes and linear regression for continuous outcomes, adjusted for sex, calendar year, mother's socio-economic position and hormonal contraception use. Those with acne had a lower risk of not completing upper secondary education (relative risk (RR): 0.79; 95% confidence interval [CI]: 0.76-0.83) and higher education (RR: 0.90; 95% CI: 0.88-0.91), with absolute differences up to 4 percentage points. Persons with acne had slightly higher income (mean percentile difference: 2.6%, 95% CI: 2.2-2.9) and lower risk of long-term unemployment than those without acne (9.8% vs. 11.4%; RR: 0.90; 95% CI: 0.87-0.93). The prevalence of being single until age 30 was similar (19.7% vs. 20.1%; adjusted RR: 0.96; 95% CI: 0.94-0.98) but childlessness was slightly more prevalent (60.5% vs. 57.5%; adjusted RR: 1.03; 95% CI: 1.02-1.04). However, all associations were attenuated or lost in secondary analysis restricted to exposure-discordant siblings to address confounding from family-related factors. Acne during adolescence does not seem to affect long-term educational, labour market or relationship outcomes. However, there is a need for additional studies to validate the findings in untreated patients and different health and social systems.

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

BackgroundTo determine the frequency of pregnancy complications and their association with the risk of cardiovascular outcomes in women with structural heart disease (SHD).MethodsThis nationwide registry-based cohort study included women in...

Foeto–Maternal outcomes of pregnancies beyond 41 weeks of gestation after induced or spontaneous labour

ObjectiveIt has been suggested that induction of labour before 42 weeks of pregnancy prevents foetal complications. To evaluate the maternal and foetal outcomes of induced and spontaneous labour beyond gestational week 41 + 0. Study designWe conducted a register-based nationwide cohort study that included pregnant women who were delivered in Sweden in 2016–2021. Women were classified into two groups: induction of labour (IOL) or spontaneous onset of labour (SOL). Maternal and foetal outcomes after IOL in gestational week 41 were compared with SOL in gestational week 41 and 42. ResultsComparison between the IOL (n = 23,772) and SOL (n = 62,611) groups in gestational weeks 41 showed that various parameters were higher in the IOL group: caesarean deliveries (12.3 % and 4.6 %, P < 0.001), vacuum extraction (8.7 % and 6.9 %, P < 0.001), blood loss of > 1000 ml during labour (11 % vs 8.3 %, P < 0.001). The risks were remained significant even after adjusting for potential confounders (caesarean delivery: aOR 2.36; 95 % CI, 2.23–2.50, vacuum delivery: aOR 1.09; 95 % CI, 1.03–1.16, P = 0.002, and blood loss of >1000 ml: aOR 1.25; 95 % CI 1.18–1.31). The proportions of stillbirths (0.07 % and 0.18, P < 0.001), and newborns with apgar scores < 4 at five minutes (0.4 % vs 0.3 %, P < 0.001), were also higher in the IOL group. The risk of stillbirth after IOL in gestational week 41 was increased relative to SOL in the same week and remained high after adjusting for potential confounders (aOR 1.75; 95 % CI 1.07–2.80, P = 0.025).The IOL group in gestational weeks 41 comprised a higher proportion of caesarean deliveries (12.3 % and 8.5 %, P < 0.001), but a lower (8.7 % and 9.7 %, P = 0.006) proportion of deliveries by vacuum extraction than the SOL group (n = 4548) in week 42. ConclusionsInducing labour at gestational week 41 in women with prolonged pregnancies may have adverse effects on foetal and maternal outcomes compared to those who experience spontaneous labour onset at the same gestational age. The risk of negative foetal outcomes after induction at week 41 appears similar to that in women who give birth after spontaneous labour at week 42.

Multiple myeloma: unplanned diagnostic pathways and association with risk factors and survival – a nationwide register-based cohort study in Denmark

BackgroundMultiple myeloma often presents with vague and non-specific symptoms. Many patients are diagnosed in unplanned rather than elective (planned) diagnostic pathways. This study investigates the diagnosis of multiple myeloma in unplanned pathways and the association with patient characteristics, disease profile, and survival.MethodsWe conducted a nationwide register-based study, including all patients diagnosed with multiple myeloma in Denmark in 2014–2018. Patients were categorised as diagnosed in an unplanned pathway if registered with an acute admission within 30 days prior to the multiple myeloma diagnosis and no other previously registered pathway to this diagnosis. Unplanned pathways were compared to all other pathways combined.ResultsWe included 2,213 patients diagnosed with multiple myeloma, hereof 32% diagnosed in an unplanned pathway. Comorbidity, no prior cancer diagnosis, a history of few visits to the general practitioner (GP), multiple myeloma complications at diagnosis, high-risk cytogenetics, and advanced cancer stage were associated with a higher probability of being diagnosed in an unplanned pathway. For example, 24.4% (95% confidence interval (CI): 21.8–27.0) of patients with low comorbidity (Charlson Comorbidity Index (CCI) score 0) were diagnosed in an unplanned pathway as were 50.9% (95% CI: 45.6–56.1) of patients with high comorbidity (CCI score 3+). For patients with dialysis need at the time of diagnosis the probability was 66.0% (95% CI 54.2–77.8) and 30.9% (95% CI: 28.9–32.9) for patients with no dialysis need. Patients diagnosed in an unplanned pathway had inferior survival (hazard ratio 1.44 (95% CI: 1.26–1.64)). However, this association was not seen in analyses restricted to patients surviving for more than three years.ConclusionsHigh comorbidity level, few usual GP visits, advanced disease status at diagnosis, and complications were associated with diagnosis in an unplanned pathway. Further, patients diagnosed in an unplanned pathway had inferior survival. Promoting earlier diagnosis and preventing unplanned pathways may help improve survival in multiple myeloma.

Labor market effects of rehabilitation for patients diagnosed with dizziness - a Danish nationwide register-based cohort study.

Both vestibular neuronitis (VN) and Meniere's disease (MD) have great impact on quality of life and are associated with a significant number of sick leave days absent from work. The aim was to assess labor market participation rate one year after hospital diagnosis of VN and MD and the use of rehabilitation measures. Nationwide register-based cohort study including patients with VN (n = 1,341) and MD (n = 843) and control persons matched in 1:5 with a VN cohort control (n = 6,683) and MD cohort control (n = 4,209). Compared to control persons, VN patients were more likely to be single, have higher income, and a higher Charlson comorbidity index score. MD patients had a higher level of education and a higher Charlson index compared to control persons. One year after patients were diagnosed with VN, no significant difference in labor market participation was observed (p = 0.88). However, MD patients had a 10.4% reduced probability of possessing a full-time job one year after diagnosis compared to matched control persons (58.1 ± 0.5% vs. 68.5 ± 0.5%, p < 0.001). Both VN and MD patients consulted otorhinolaryngologists, general practitioners, and physiotherapists more than control persons both before and after the initial diagnosis (p < 0.01). In addition, MD patients also consulted psychologists more frequently before and after diagnosis of the disease (p < 0.01). Intrahospital diagnosed MD increases the risk of leaving the labor market in opposition to VN. Both MD and VN are associated with significant expenses to the Danish health care system from the use of public rehabilitation measures and medical consultations.

70533 - Treatment of early gastric cancer in Sweden – a nationwide register based cohort study

Abstract Introduction Endoscopic resection (ER) for early gastric cancer (EGC) is a well-established treatment, however most studies are from Asian countries and few have examined population-based western results. The aim of this study was to evaluate treatments and outcomes for EGC in Sweden, based on data from a population-based cancer register. Method A nationwide cohort study based on the Swedish National Register for Esophageal and Gastric Cancer (NREV). We included all surgically and endoscopically treated patients with T1N0M0 gastric cancer 2006-2022. The primary endpoint was overall survival (OS). Secondary endpoints were hospital stay and 30-day mortality. Result In total 279 patients with T1N0M0 cancers were found, 189 (67.7%) patients were treated with surgery and 90 (32.3%) with ER. The groups were comparable regarding baseline characteristics, except that the ER group had a higher ASA-score (p=0.046). As for the primary endpoint, there was no statistically significant difference in OS between the two groups (median survival 11.9 years for surgery vs 10.0 years for ER, p=0.590). As for the secondary endpoints, ER was associated with a shorter hospital stay (median 9 days for surgery vs 1 day for ER, p&amp;lt;0.001). There was no statistical difference in 30-day mortality, but a numerical difference was observed (2.1 % for surgery and 0 % for ER, p=0.164). Discussion In this population-based study, ER and surgery had comparable OS for EGC. ER was associated with a shorter hospital stay.

Carpal tunnel syndrome and occupational hand exposures: a Danish nationwide cohort study

ObjectivesThe aim was to examine exposure–response relations between occupational hand exposures and carpal tunnel syndrome (CTS) and to compare the relation between surgery-treated and non-surgery-treated CTS. The secondary aim was...

Characteristics, demographics, and epidemiology of possible chronic cough in Sweden: A nationwide register-based cohort study.

To show clinical characteristics, treatments, and comorbidities in chronic cough in a nationwide cohort. Two cohorts were created. A national cohort with individuals from two population-based databases; the National Patient Register and Swedish Prescribed Drug Register. Secondly, a regional cohort including primary care data. Adults with at least one cough diagnosis (ICD-10 R05) and/or individuals with ≥2 dispensed prescriptions for relevant cough-medication within the inclusion period, 2016-2018, were identified. Individuals on medications which may instigate cough or suggest acute infection or diagnosed with conditions where cough is a cardinal symptom, were excluded. Those remaining were defined as having possible refractory or unexplained chronic cough (RCC/UCC). Altogether 62,963 individuals were identified with possible RCC/UCC, giving a national prevalence of about 1%. Mean age was 56 years and 60% were females. Many (44%) of the individuals with possible RCC/UCC visited cough relevant specialist clinics during the study period, but less than 20% received a cough diagnosis. A majority (63%) had evidence of RCC/UCC in the 10 years prior to inclusion in the study. In the regional cohort, including primary care data, the prevalence of RCC/UCC was doubled (2%). Cough medicines were mainly prescribed by primary care physicians (82%). Most individuals with possible RCC/UCC sought medical care in primary care, and had a long history of cough, with various treatments tried, indicating a substantial burden of the condition. Referrals to specialist care were very rare. The results underline the need for a structured multidisciplinary approach and future therapeutic options.

Use of proton pump inhibitors after laparoscopic gastric bypass and sleeve gastrectomy: a nationwide register-based cohort study.

L-RYGB and L-SG are the dominant bariatric procedures worldwide. While L-RYGB is an effective treatment of coexisting gastroesophageal reflux disease (GERD), L-SG is associated with an increased risk of de-novo or worsening of GERD. The study aimed to evaluate the long-term use of proton pump inhibitors (PPI) following laparoscopic Roux-en-Y gastric bypass (L-RYGB) and sleeve gastrectomy (L-SG). This nationwide register-based study included all patients undergoing L-RYGB or L-SG in Denmark between 2008 and 2018. In total, 17,740 patients were included in the study, with 16,096 and 1671 undergoing L-RYGB and L-SG, respectively. The median follow up was 11 years after L-RYGB and 4 years after L-SG. Data were collected through Danish nationwide health registries. The development in PPI use was assessed through postoperative redeemed prescriptions. GERD development was defined by a relevant diagnosis code associated with gastroscopy, 24 h pH measurement, revisional surgery or anti-reflux surgery. The risk of initiation of PPI treatment or GERD diagnosis was evaluated using Kaplan-Meier plots and COX regression models. The risk of continuous PPI treatment was examined using logistic regression modeling. The risk of initiating PPI treatment was significantly higher after L-SG compared with L-RYGB (HR 7.06, 95% CI 6.42-7.77, p < 0.0001). The risk of continuous PPI treatment was likewise significantly higher after L-SG (OR 1.45, 95% CI 1.36-1.54, p < 0.0001). The utilization of PPI consistently increased after both procedures. The risk of GERD diagnosis was also significantly higher after L-SG compared with L-RYGB (HR 1.93, 95% CI 1.27-2.93, p < 0.0001). The risk of initiating and continuing PPI treatment was significantly higher after L-SG compared with L-RYGB, and a continuous increase in the utilization of PPI was observed after both procedures.

The PATCH study: Prevalence of Hearing Loss During Ageing and Treatment Choices in Osteogenesis Imperfecta: A Danish Nationwide Register-Based Cohort Study

Osteogenesis imperfecta (OI) is a group of rare hereditary collagen disorders. Hearing loss (HL) is a known complication linked to changes in the bones of the middle ear seen in OI. We aimed to determine the prevalence, age at debut, incidence, and risk of HL, surgery on bones of the middle ear, and use of hearing aids. A Danish nationwide, register-based cohort study. Data were extracted from the Danish National Patient register. Anyone with an OI diagnosis between January 1st 1977 and December 31st 2018, matched 1:5 with a reference population (Ref.Pop) on birthyear and sex, were included. 864 persons (487 women) with OI were included in the study and 4276 (2330 women) in the Ref.Pop. The sub-hazard ratio (SHR) for any HL was 4.56 [95% CI 3.64–5.71], with a prevalence of 17.0% and 4.0% in the OI cohort and Ref.Pop. Median age at debut was 42 and 58 years, respectively. The risk of otosclerosis and/or surgery was higher in the OI cohort (SHR 22.51 [95% CI 12.62–40.14]), with a median age at debut of 43 and 32 years in the OI cohort and Ref.Pop, respectively. Hearing aid use was more frequent in the OI cohort (SHR 4.16 [95% CI 3.21–5.40]) than in the Ref.Pop. The median age at debut was 45 and 60 years in the OI cohort and Ref.Pop, respectively. Persons with OI have a higher risk and prevalence of HL, hearing aids, and surgery, debuting younger, and prevalence increases with age.

Incidence and clinical significance of non-tuberculous mycobacteria among migrants in Denmark: A nationwide register-based cohort study from 1991 through 2021

BackgroundThere is limited knowledge about non-tuberculous mycobacteria (NTM) infections in migrants. We aimed to assess the incidence and clinical significance of NTM among migrants in Denmark. MethodNationwide register-based cohort study of migrants with a positive NTM culture in Denmark from 1991 through 2021, stratified by patient demographics, disease localisation, species, and clinical significance. Results433 migrants had a positive NTM culture, resulting in an overall incidence rate (IR) of 3.7 (95%CI 3.3–4.0) per 100,000 migrants. Overall NTM IRs for definite disease were 1.0 (95%CI 0.9–1.2), possible disease 1.0 (95%CI 0.8–1.2), and isolation 1.7 (95%CI 1.4–1.9) per 100,000 migrants. Migrants had considerably higher age- and sex-adjusted NTM IRs of positive cultures (incidence rate ratio [IRR] = 2.1, 95%CI 1.9–2.3, p < 0.001), possible disease (IRR = 2.4, 95%CI 2.0–3.0, p < 0.001), and isolation (IRR = 4.6, 95%CI 3.9–5.4, p < 0.001) compared to Danish-born, but not of definite disease (IRR = 1.1, 95%CI 0.9–1.3, p = 0.562). IRs of migrants with positive NTM cultures did not increase over time (−0.8 %/year, p = 0.133). ConclusionsMigrants have a higher, but stable, burden of NTM compared with Danish-born. The higher rates likely reflect that more specimens are examined for Mycobacterium tuberculosis. Microbiologically classified definite NTM disease is not substantially more common among migrants.

Drug survival and risk factors for ADHD medication discontinuation in adults: A Danish Nationwide Registry-based cohort study.

Attention deficit hyperactivity disorder (ADHD) medication has proven effective for treating ADHD in adults, nonetheless previous studies have shown high rates of medication discontinuation. To assess drug survival and identify risk factors associated with discontinuation of ADHD medication. A nationwide registry-based cohort study in Danish adults who redeemed a prescription for ADHD medication for the first time between 2010 and 2015. All patients were followed for 5 years from the first redeemed prescription. Discontinuation was defined as a gap of 12 months between redemptions. Logistic regression analysis with odds ratio (OR) and Kaplan Meier analysis were used to examine risk factors (sex, age, socioeconomic status, substance use disorders, and comorbidities) associated with discontinuation. Twenty three thousand nine-hundred and sixteen patients with ADHD were identified. The 5-year overall drug survival was 29% in women vs. 23.5% in men. The risk of medication discontinuation was significantly higher in men compared to women, OR 1.26 (95% CI 1.19-1.34, p < 0.001). Adults aged 31-50 years had a significantly decreased risk of medication discontinuation compared to adults aged 18-30 years, OR 0.57 (95% CI 0.53-0.61, p < 0.001). Switching ADHD medication two times or three times or more significantly decreased the risk of discontinuation; OR 0.53 (95% CI 0.49-0.56, p < 0.001) and OR 0.26 (95% CI 0.23-0.30, p < 0.001), respectively. Substance use disorders and certain comorbidities were associated with medication discontinuation. Eating disorders, OR 0.71 (95% CI 0.64-0.78, p < 0.001), intellectual disabilities, OR 0.65 (95% CI 0.59-0.73, p < 0.001) and sleep disorders, OR 0.42 (95% CI 0.37-0.49, p < 0.001) were associated with continuation of ADHD medication. The 5-year overall drug survival was longer in women compared to men. Women with ADHD; adults aged 31-50; and patients with comorbid eating disorder; intellectual disability; sleep disorder and medication switching were individually associated with continuation of ADHD medication. Various factors were associated with medication discontinuation. Discontinuation should be acknowledged as a common phenomenon in patients with ADHD and calls for increased attention from the treatment responsible prescriber or team. Moreover, our findings suggest that timely, frequent medication switching, or temporary regimens may indeed represent optimal management strategies for a significant proportion of the ADHD population.

Stent retriever versus aspiration based thrombectomy: impact on first pass reperfusion, procedure time, and clinical outcomes in large vessel occlusion. Nationwide registry based cohort study

BackgroundFirst pass reperfusion (FPR), defined as near complete reperfusion (extended Treatment in Cerebral Ischemia (eTICI) score 2c/3) in a single attempt without rescue therapy has been proposed as a quality...

Neurological function before and after an in-hospital cardiac arrest – A nationwide registry-based cohort study

BackgroundAccording to the Utstein Registry Template for in-hospital cardiac arrest (IHCA), a good neurological outcome is defined as either Cerebral Performance Category (CPC) 1–2 at discharge from hospital or unchanged CPC compared to baseline. However, the latter alternative has rarely been described in IHCA. This study aimed to examine CPC at admission to hospital, the occurrence of post-arrest neurological deterioration, and the factors associated with such deterioration. MethodsWe studied adult IHCA survivors registered in the Swedish Registry of Cardiopulmonary Resuscitation between 2007 and 2022. The CPC was assessed based on information from admission and discharge from hospital. The data were analyzed using descriptive statistics and significance tests. ResultsOne in ten IHCA had a CPC score > 1 at admission to hospital. Out of 7,677 IHCA who survived until hospital discharge and had full CPC data, 6,774 (88%) had preserved CPC, 150 (2%) had improved CPC, and 753 (10%) had deteriorated CPC. Among the factors significantly associated with deteriorated neurological function are IHCA in a general ward or intensive care unit, non-shockable rhythm, no ECG surveillance, and a higher proportion of intra-arrest and post-resuscitation treatments (all p-values < 0,05). ConclusionMost patients had preserved neurological function compared to admission. Factors associated with deteriorated neurological function are mainly concordant with established risk factors for adverse outcomes and are primarily intra-arrest and post-resuscitation, making deterioration hard to predict. Further, every tenth survivor was admitted with CPC more than 1, stressing the use of unchanged CPC as an outcome in IHCA.

Imprinting disorders in children conceived with assisted reproductive technology in Sweden

ObjectiveTo assess whether the use of assisted reproductive technology for conception is associated with imprinting disorders in children and the impact of parental factors related to infertility. DesignA nationwide register-based cohort study. SubjectsAll liveborn singletons in Sweden (N = 2 084 127) between 1997-2017 with follow-up to December 31, 2018. ExposureThe use of specific methods implemented in the assisted reproductive technology Main Outcome MeasuresThe International Classification of Diseases version 10 was used to identify three distinct imprinting disorder groups: Prader-Willi/Silver-Russell syndrome, Beckwith-Wiedemann syndrome, and central precocious puberty. The Cox model combined with inverse probability treatment weights were used to estimate weighted hazard ratio (wHR) with 95% confidence interval (CI), accounting for multiple confounders. ResultsA total of 1044 children were diagnosed with the disorders of interest, and 52 of them were conceived with assisted reproductive technology. The overall risk of being diagnosed with any of the studied imprinting disorders was elevated in children conceived with ART compared to all other children (HR 1.84, 95% CI: 1.38-2.45). After adjusting for parental background factors, the association was partially attenuated (wHR 1.50, 95% CI: 0.97-2.32), but remained also in the weighted comparison restricted to children of couples with known infertility (wHR 1.52, 95% CI: 1.05-2.21). For the specific diagnoses of Prader-Willi/Silver-Russell syndrome and Beckwith-Wiedemann syndrome, compared to children of couples with known infertility, children conceived with assisted reproductive technology showed a small excess risk, which could not be distinguished from the null (wHR 1.56 [95% CI: 0.93-2.62] and 1.80 [95% CI: 0.99-3.28], respectively). Further subgroup analysis showed that the combined use of intra-cytoplasmic sperm injection and cryopreserved embryos was associated with higher risk of both Prader-Willi/Silver-Russell syndrome (wHR 4.60, 95% CI: 1.72-12.28) and Beckwith-Wiedemann syndrome (wHR 6.69, 95% CI: 2.09-21.45). The number of central precocious puberty cases in children conceived with assisted reproductive technology was too small (N=3) to make any meaningful inference. ConclusionThe combined use of intra-cytoplasmic sperm injection and cryopreserved embryos was associated with small elevated risks of Prader-Willi/Silver-Russell syndrome and Beckwith-Wiedemann syndrome in children, independent of parental factors related to infertlity.

Impact of childhood traumatic brain injury on fitness for service class, length of service period, and cognitive performance during military service in Finland from 1998 to 2018: A retrospective register-based nationwide cohort study.

Traumatic brain injury (TBI) can cause neuronal damage and cerebrovascular dysfunction, leading to acute brain dysfunction and considerable physical and mental impairment long after initial injury. Our goal was to assess the impact of pediatric TBI (pTBI) on military service, completed by 65-70% of men in Finland. We conducted a retrospective register-based nationwide cohort study. All patients aged 0 to 17 years at the time of TBI, between 1998 and 2018, were included. Operatively and conservatively treated patients with pTBI were analyzed separately. The reference group was comprised of individuals with upper and lower extremity fractures. Information on length of service time, service completion, fitness for service class, and cognitive performance in a basic cognitive test (b-test) was gathered from the Finnish Military Records for both groups. Linear and logistic regression with 95% CI were used in comparisons. Our study group comprised 12 281 patients with pTBI and 20 338 reference group patients who participated in conscription. A total of 8 507 (66.5%) men in the pTBI group and 14 953 (71.2%) men in the reference group completed military service during the follow-up period. Men in the reference group were more likely to complete military service (OR 1.26, CI 1.18-1.34). A total of 31 (23.3%) men with operatively treated pTBI completed the military service. Men with conservatively treated pTBI had a much higher service rate (OR 7.20, CI 4.73-11.1). In the pTBI group, men (OR 1.26, CI 1.18-1.34) and women (OR 2.05, CI 1.27-3.36) were more likely to interrupt military service than the reference group. The PTBI group scored 0.15 points (CI 0.10-0.20) less than the reference group in cognitive b-test. PTBI groups had slightly shorter military service periods and higher interruption rate than our reference-group. There were only minor differences between groups in cognitive b-test.

Thyroid dysfunction and exudative age-related macular degeneration - A longitudinal nationwide registry-based cohort study.

The association between thyroid dysfunction and exudative age-related macular degeneration (AMD) is unknown. In this Danish longitudinal nationwide registry-based cohort study we included all Danish residents aged 50-100 between 2008 and 2018. Using the Danish national registries, we studied the association between thyroid dysfunction and exudative AMD. Thyroid dysfunction was classified as two consecutive redeemed prescriptions of thyroid hormones (hypothyroidism) or anti-thyroid medication (hyperthyroidism). Exudative AMD was classified as an ICD diagnosis of AMD and a code for anti-VEGF treatment. All patients are treated for exudative AMD in a hospital in Denmark, and we therefore have complete registration of this patient group. We included 2 087 305 individuals, of which 1 072 567 (51.4%) were women; 59 318 (2.8%) had hypothyroidism, and 33 922 (1.6%) had hyperthyroidism. During a median follow-up of 11 years, 26 998 (1.3%) people developed exudative AMD. Hypothyroidism (adjusted hazard ratio [HR]: 1.17; 95% confidence interval [CI] 1.10-1.25; p < 0.001) and hyperthyroidism (HR: 1.23; 95% CI:1.13-1.34; p < 0.001) were both associated with the development of exudative AMD. The age-stratified analyses yielded similar results to the main analyses, except that the risks were exaggerated in the older part of the population. This is the first longitudinal nationwide study showing that both hypo- and hyperthyroidism are associated with an increased risk of exudative AMD. AMD is a quantitative problem in the population and our findings could have a public health impact. Further studies are needed to study the underlying mechanisms of the association.

Gender affirming treatment and employment rate in 3,812 Danish transgender persons and 38,120 controls. A nationwide register-based cohort study

Gender affirming treatment and employment rate in 3,812 Danish transgender persons and 38,120 controls. A nationwide register-based cohort study

Pregnancy loss in women with endocrine disorders - a nationwide registry-based cohort study of 366,548 Danish women

Pregnancy loss in women with endocrine disorders - a nationwide registry-based cohort study of 366,548 Danish women