Density In Postmenopausal Women Research Articles

Effects of Parity and Breastfeeding Duration on Bone Density in Postmenopausal Women

PurposeThis study aimed to identify the effect of parity and breastfeeding duration and the occurrence of lumbar vertebral and femoral neck osteoporosis in Korean postmenopausal women. MethodsThis study analyzed the data of 1,770 women based on the 2010–2011 results of the Korea National Health and Nutrition Examination Survey. Extracted data concerning bone density included variables known to be associated with osteoporosis. Complex sample multivariate logistic regression analysis was conducted to determine whether parity and breastfeeding duration were associated with osteoporosis in postmenopausal women. ResultsParity was not associated with postmenopausal osteoporosis in the femoral neck or lumbar vertebrae; however, the risk of femoral neck osteopenia was significantly higher in women with a history of 12–24 months of breastfeeding than in women who breastfed for less than 12 months (odds ratio = 2.12, 95% confidence interval = 1.07–4.21). In women who breastfed for 24 months or longer, the risk of lumbar vertebral osteoporosis was significantly higher than in those who breastfed for less than 12 months (odds ratio = 2.73, 95% confidence interval = 1.18–6.32). ConclusionBreastfeeding duration may affect the occurrence of lumbar vertebral or femoral neck osteopenia or osteoporosis. Therefore, women who breastfeed for one year or more require education on the risk of bone loss and the need for preventive measures such as adequate calcium intake and physical exercise.

GENE POLYMORPHISM;

Introduction: Reduced bone density in postmenopausal women is a complex disease with a strong genetic association. Causative factors are both acquired and genetic. Single nucleotide polymorphisms may be associated with genetic predisposition of this condition. Objectives: The purpose of this study is to find out an association between single nucleotide polymorphism (rs4845617) of IL-6R (Interleukin 6 receptor) gene and reduced bone density in cases of postmenopausal women and controls. Study Design: It is a retrospective case-control study. Duration: From March 2017 to Nov 2017. Setting: Different hospitals of Sargodha. Material and Method: About 30 blood samples were collected from postmenopausal women affected with reduced bone density and 30 healthy age-and gender-matched controls. All the blood samples underwent DNA extraction, Polymerase chain reaction and DNA sequencing techniques. Result: In this study, post menopausal women were screened for the rs4845617 in IL-6R gene for their association with reduced bone density. The chi-square test of independence showed that G allele of rs4845617 was significantly associated with reduced bone density in postmenopausal women (OR=2.28, χ2=8.98, p=0.002). Conclusion: Our results signify that this polymorphism may play a role in reduced bone density susceptibility in postmenopausal women.

A Randomized Placebo-Controlled Trial of Low- Versus Moderate-Dose Vitamin D3 Supplementation on Bone Mineral Density in Postmenopausal Women With HIV.

Prevalence of osteoporosis and fracture is increased among older people with HIV. We compared the effects of low (1000 IU) vs moderate (3000 IU) vitamin D3 (VitD) supplementation on areal bone mineral density (aBMD) and volumetric bone mineral density (vBMD) in African American and Hispanic postmenopausal women with HIV on antiretroviral therapy. We performed a 12-month prospective, randomized, double-blind, placebo-controlled study with primary outcomes of change in aBMD by dual-energy X-ray absorptiometry (DXA) and secondary outcomes of change in vBMD by quantitative computed tomography and bone turnover markers. An intent-to-treat analysis was performed on 85 randomized subjects (43 low and 42 moderate) for primary DXA outcomes, and complete case analysis was performed for secondary outcomes. Mean age was 56 ± 5 years, median CD4 count was 722 cells/mm, and 74% had HIV RNA ≤ 50 copies/mL. Serum 25-OHD was higher in the moderate than low VitD group at 6 months (33.1 ± 10.3 vs 27.8 ± 8.1 ng/mL, P = 0.03) and 12 months, but parathyroid hormone levels remained similar. Percent change in aBMD, vBMD, and bone turnover markers did not differ between low and moderate VitD groups before or after adjustment for baseline aBMD. VitD supplementation at 3000 IU daily increased mean total 25-OHD levels in postmenopausal women with HIV, but we did not find evidence of an effect on BMD beyond those observed with 1000 IU daily. Future studies are necessary to determine whether VitD supplementation is beneficial in this patient population, and if so, what dose is optimal for skeletal health.

Correlation of Muscle Strength and Mass with Bone Mineral Density in Postmenopausal Women

Introduction: Osteoporosis is a systemic disease of the bone, which entails an increased riskof fracture, with high impact on morbidity, mortality and costs in the health system. Severalstudies have shown a relationship between muscle mass and strength with bone mineral density.Our objective is to determine the correlation between these variables in postmenopausalwomen. Materials and Methods: For the correlation study, 100 postmenopausal womenolder than 50 years were selected randomly and a sociodemographic survey was conducted,and muscle strength was determined by manual grip strength, which was measured with adigital dynamometer. Bone mineral density measurements and muscle mass were obtainedwith densitometry. The correlation between strength, muscle mass, and bone mineral densitywas determined by a Spearman correlation. Results: The average age was 62.8 ± 7.48. Femurand column bone mineral density were significantly related to the muscle mass index, weight,and body mass index. The prevalence of fragility fracture was 17%. The bone mineral densityof the femur was lower in patients with fragile fracture, and there was a negative and significantcorrelation between femur bone mineral density and skeletal muscle mass index. Conclusion:Bone health studies should include the study of muscle mass index and the skeletal musclemass index. The improvement of the muscle mass index can influence femoral and vertebralbone mineral density with significant impact on fragility fractures. This is the first study of itskind conducted in Colombia and South America.

Association of polymorphisms of the TNFRSF11B and TNFSF11 genes with bone mineral density in postmenopausal women from western Mexico

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Digital panoramic radiography and cone-beam CT as ancillary tools to detect low bone mineral density in post-menopausal women.

To evaluate the usefulness of the mandibular cortical index (MCI) obtained by digital panoramic radiography (DPR) and by panoramic reconstruction (PR) of cone-beam CT (CBCT) with three different slice thicknesses for the screening of low bone mineral density (BMD) in post-menopausal women. Two trained oral and maxillofacial radiologists assessed the MCI based on the morphology of the mandibular bone cortex (classified as C1, C2 or C3). The DPR and PR of CBCT with slice thicknesses of 5, 15 or 25 mm were compared to the BMD obtained by dual-energy X-ray absorptiometry (DXA) in post-menopausal women. Measures related to accuracy were calculated with MedCalc software. The confidence interval was set at 95%. 54 women (mean age 58.70 ± 7.35 years) participated in the study. The sensitivity and specificity values obtained for DPR were 52.6% and 56.2%, respectively, and values for PR of CBCT with 5, 15, and 25 mm slice thicknesses were 63.1% and 43.7%, 50.0% and 50.0%, and 52.6% and 62.5%, respectively. For the tools evaluated, the positive likelihood ratio ranged from 1.00 to 1.40 and negative likelihood ratio from 0.76 to 1.00. The positive predictive value (PPV) ranged from 70.4 to 76.9% and the negative predictive value (NPV) from 29.6 to 35.7%. Among the examinations, the highest value for area under the curve (AUC) was obtained for CBCT with 25 mm slice thickness (57.6%). The MCI calculated by DPR and CBCT differed with regard to accuracy. Within the limitations of this study, the PR of CBCT with 25 mm slice thicknesses seems to be the most accurate among the examinations evaluated. Should the dentist be attentive, DPR and CBCT may be useful tools for the screening of low BMD in post-menopausal women, facilitating their timely referral for further assessment.

An Evaluation of the Association of Reproductive History and Multiple Births during Adolescence with Postmenopausal Osteoporosis.

Introduction Osteoporosis is the most common metabolic bone disease characterized by low bone mass. Reproductive factors are known to affect bone mineral density (BMD). Calcium loss from maternal bone and decreased BMD have been observed especially during pregnancy and lactation, although this loss has been reported to recover within 6 – 12 months. There is no consensus on whether the effect of reproductive factors on the bone is positive or negative. The adolescent period is important for total bone mass, and total bone mass is significant in osteoporosis. The aim of this study was to investigate the effect of first gestational age, multiple births during adolescence, interpregnancy interval and reproductive history such as duration of breastfeeding on bone mineral density in postmenopausal women. Materials and Methods BMD was measured in a total of 196 postmenopausal patients and in accordance with the results, analysis was made of three groups as normal, osteopenia and osteoporosis. Dual Energy X-Ray Absorptiometry (DEXA) was used to take the lumbar, femoral and total bone BMD measurements. Results No statistically significant difference was determined between the groups in respect of total breastfeeding time (p = 0.596). It was detected that an increased interpregnancy interval decreased the risk of osteoporosis. In patients with osteoporosis, the mean interpregnancy interval was 1.4 ± 0.73 years, while it was longer in patients with osteopenia (1.92 ± 1.20) and normal BMD (2.45 ± 1.77) (p = 0.005). While no effect was determined of the first gestational age on BMD, in the univariate logistic regression analysis, multiple births in the adolescent period were seen to increase the risk of osteoporosis 6.833-fold (p = 0.001, OR = 6.833, 95% CI = 2.131 – 21.908; p = 0.001). The increase in the age of menopause was determined to decrease the risk of osteoporosis (OR = 0.911, 95% CI = 0.843 – 0.985; p = 0.019). Conclusion Having frequent births throughout the whole reproductive age and having more than one child in adolescence has an adverse effect on postmenopausal bone mineral densities.

Association between metabolic risks and bone mineral density in postmenopausal women

Background: Menopause is associated with osteoporosis and an increased risk of metabolic disorders, including obesity, abdominal adiposity, hyperlipidemia, hypertension, and insulin resistance, which may increase the risk of cardiovascular disease (CVD). Recent studies have demonstrated a correlation between fat, glucose, and bone metabolism which could contribute to CVD and osteoporosis. This study examined the association between metabolic risk factors and bone mineral density (BMD) in postmenopausal women. Materials and Methods: The authors determined the anthropometric values [waist-hip ratio (WHR), visceral fat area (VFA), body fat mass (BFM), and skeletal muscle mass (SMM)], lipid profile, fasting plasma glucose levels, high-sensitivity C-reactive protein levels, homeostasis model assessment of insulin resistance (HOMA-IR) scores, serum leptin and adiponectin levels, serum osteocalcin level [total osteocalcin (tOC) and undercarboxylated osteocalcin (ucOC)], and BMDs of the lumbar spine and femoral neck in 137 postmenopausal women. Results: There was a positive correlation between BFM, HOMA-IR score, serum leptin level, and BMD of the lumbar spine, and a negative correlation between BFM, total cholesterol, serum adiponectin, and BMD of the lumbar spine after adjusting for age, years since menopause, current alcohol consumption, and current smoking status. In a multiple regression analysis, serum adiponectin level and SMM were the most important predictors of the BMD of the lumbar spine. Conclusion: There were several metabolic risk variables that had a harmful effect on the BMD of the lumbar spine, but not the femoral neck. However, higher serum adiponectin levels were negatively correlated with BMD of the lumbar spine as adiposity decreased.

Effects of thyrotropin suppression on lumbar bone mineral density in postmenopausal women with differentiated thyroid carcinoma.

PurposeThe aim of this study was to evaluate the effect of postoperative thyroid-stimulating hormone suppression (TSHS) on bone mineral density (BMD) in Chinese postmenopausal women with differentiated thyroid carcinoma (DTC).Patients and methodsA total of 225 postmenopausal women with DTC who had received TSHS were included in the study. Postmenopausal women with postoperative DTC undergoing thyroid residual ablation or metastasis treatment between 2009 and 2015 were enrolled and followed up for 2 years. They were divided into two groups: TSHS group (median thyroid-stimulating hormone [TSH] <0.3 μIU/mL) and postmenopausal control group (median TSH >0.3 μIU/mL). Lumbar 1–4 BMD levels were measured by a dual-energy X-ray absorptiometry (DXA) at baseline and 6, 12 and 24 months. All patients had calcium and vitamin D supplementation. The diagnosis of osteopenia (−1 SD > T >−2.5 SD) and osteoporosis (T <−2.5 SD) was made according to WHO guidelines.ResultsThyroid cancers included 211 papillary carcinomas and 14 follicular carcinomas. One hundred and fifty-four patients were in the TSHS group, and 71 patients were in the non-suppressed TSH group (postmenopausal controls). No significant differences were found in the BMD of the lumbar spine between baseline and after 6, 12 and 24 months, pre and post treatment in TSHS and non-suppressed TSH patients. Compared with pre-TSHS, there was a reduction in the BMD of 1.9% in the lumbar spine at the 2-year follow-up. Significant difference in the number of osteopenia and osteoporosis patients at 24 months (χ2=2.88, P=0.004) was found between the TSHS (103/152) and postmenopausal control (32/68) groups. TSHS is not a significant risk of bone loss, but it is the incidence of osteopenia in postmenopausal women with DTC.ConclusionOur 2-year follow-up data indicated that TSHS had little effect on BMD in postmenopausal women with DTC. Large population with at least 5-year follow-up should be further investigated. BMD in postmenopausal women with DTC should be followed up regularly.

Lean Body Mass in the Prediction of Bone Mineral Density in Postmenopausal Women.

Owing to conflicting results of the association between body composition and bone mineral density (BMD), we investigated the relationship between fat mass (FM), lean mass (LM), and BMD in New Zealand postmenopausal women. We hypothesized that increased LM will indicate a higher BMD. A cross-sectional study was performed examining the associations between body composition, anthropometric measures, activity energy expenditure, and bone health status (using dual-energy X-ray absorptiometry [DXA]). A total of 127 healthy postmenopausal women aged between 54 and 81 years. Both FM and LM were significantly associated with BMD at all sites. However, LM, not FM, was the strongest predictor of femoral neck (FN) BMD (β = 0.497, p < 0.001), hip BMD (β = 0.495, p < 0.001), spine BMD (β = 0.449, p < 0.001), and whole body BMD (β = 0.406, p < 0.001). Age was negatively associated with FN and hip BMD. LM was positively associated with FN, spine, hip, and whole body BMD. Our findings suggest the need to increase LM rather than FM highlighting the importance of physical activity for this age group.

Dietary Inflammatory Index and Bone Mineral Density in Postmenopausal Women

Dietary Inflammatory Index and Bone Mineral Density in Postmenopausal Women

Association between nonalcoholic fatty liver disease and bone mineral density in postmenopausal women

Objective: Growing evidence suggests that nonalcoholic fatty liver disease (NAFLD) is associated with reduced bone mineral density (BMD). This study examined the association between NAFLD and BMD in postmenopausal Korean women.Methods: This retrospective cross-sectional study analyzed 3739 postmenopausal women aged 50–59 years who visited a health promotion center for a routine checkup from 2009 to 2014. Menopause was defined as absence of menstruation for ≥12 months and an elevated follicle-stimulating hormone serum level (>20 IU/L). Women were excluded if they had a history of disease or use of medication that might affect bone metabolism. NAFLD was diagnosed by ultrasonography; BMD was measured by dual-energy X-ray absorptiometry. BMDs were compared according to the presence of NAFLD, and associations between NAFLD and BMD were analyzed after adjustment.Results: Among 3739 postmenopausal women, 605 (16.2%) had NAFLD. Mean BMD at the lumbar spine (P = 0.017) and femur neck (P < 0.0001) was significantly lower in women with NAFLD than in those without NAFLD. Associations between NAFLD and BMD were significantly negative at both sites after adjusting for potential clinical confounders and factors which were significantly associated with BMD.Conclusions: NAFLD is negatively associated with BMD in postmenopausal women. A longitudinal study is recommended.

Combination therapy of curcumin and alendronate modulates bone turnover markers and enhances bone mineral density in postmenopausal women with osteoporosis.

This study evaluated the effects of combination therapy of curcumin and alendronate on BMD and bone turnover markers in postmenopausal women with osteoporosis. In a randomized, double-blind trial study, 60 postmenopausal women were divided into three groups: control, alendronate, and alendronate + curcumin. Each group included 20 patients. Total body, total hip, lumbar spine and femoral neck BMDs were measured by dual-energy X-ray absorptiometry (DXA) at baseline and after 12 months of therapy. Bone turnover markers such as bone-specific alkaline phosphatase (BALP), osteocalcin and C-terminal cross-linking telopeptide of type I collagen (CTx) were measured at the outset and 6 months later. Patients in the control group suffered a significant decrease in BMD and increased bone turnover markers at the end of study. The group treated with only alendronate showed significantly decreased levels of BALP and CTx and increased levels of osteocalcin compared to the control group. The alendronate group also showed significant increases in the total body, total hip, lumbar spine and femoral neck BMDs at the end of study compared to the control group. In the curcumin + alendronate group, BALP and CTx levels decreased and osteocalcin levels increased significantly at the end of study compared to the control and alendronate groups. BMD indexes also increased in four areas significantly at the end of study compared to the control and alendronate groups. The combination of curcumin and alendronate has beneficial effects on BMD and bone turnover markers among postmenopausal women with osteoporosis. Arch Endocrinol Metab. 2018;62(4):438-45.

Physical Activity-does it Really Increase Bone Density in Postmenopausal Women? A Review of Articles Published Between 2001-2016.

Physical activity is known for its many health benefits; among them being the positive effect on bone health during the life cycle. During childhood, physical stress stimulates bone remodeling and increases density. However, due to hormonal changes during adulthood, and mainly during postmenopause the rate of bone remodeling is slowed down and is less efficient. As a result, argument has arisen in the literature regarding the benefit or harm of physical activity on bone health among postmenopausal women. The study aims to examine the efficacy of physical activity for improving Bone Mineral Density (BMD) in postmenopausal women based on a review of the literature. The articles included in the review were chosen from three databases (PubMed, SPORT Discus with full text and Science Direct). Only publications with intervention studies which provided BMD measures clearly affected by physical activity in postmenopausal women were included. Twelve articles met the criteria for inclusion. In general, physical activity had a positive effect on BMD. Exercise prevented bone loss and in some cases, it contributed to the increase in BMD. Physical activity may improve BMD in postmenopausal women. However, the exact type of activity, its intensity, its duration and its frequency, are still unclear. Further studies are needed to determine the precise training protocol for postmenopausal women.

Effect of Long-Term Xanthophyll and Anthocyanin Supplementation on Lutein and Zeaxanthin Serum Concentrations and Macular Pigment Optical Density in Postmenopausal Women.

Xanthophylls (lutein, L; zeaxanthin, Z) and anthocyanins are often included in food supplements to improve ocular health. There are no dietary reference intakes for them. The aim was to assess the effects of L, Z and anthocyanin supplementation on short and long-term lutein status markers (serum concentration and macular pigment optical density (MPOD)). Seventy-two postmenopausal women were randomized into a parallel study of 8 months: Group A—anthocyanines (60 mg/day); Group X—xanthophylls (6 mg L + 2 mg Z/day); Group X+A—anthocyanines (60 mg/day) + xanthophylls (6 mg L + 2 mg Z/day). At the beginning of the study, 4 and 8 month serum L and Z concentrations were determined (HPLC), as well as L, Z and anthocyanine dietary intake and MPOD (heterochromic flicker photometry). Baseline concentrations of L (0.35 ± 0.19 μmol/L), Z (0.11 ± 0.05 μmol/L), L+Z/cholesterol/triglycerides (0.07 ± 0.04 μmol/mmol) increased in Group X (2.8- and 1.6-fold in L and Z concentrations) and in group XA (2- and 1.4-fold in L and Z concentrations). MPOD (baseline: 0.32 ± 0.13 du) was not modified in any of the groups at the end of the study. There were no differences in the dietary intake of L+Z and anthocyanin at any point in time in any group. Supplementation of L and Z at a dietary level provoked an increase in their serum concentration that was not modified by simultaneous supplementation with anthocyanins.

Reproductive factors influencing bone mineral density in postmenopausal women

ABSTRACTThis study examined the relationship between reproductive characteristics and bone mineral density (BMD) in postmenopausal women who had been referred to the menopause clinics of the National Population and Family Development Board and of the Hospital Kuala Lumpur from July 2011 to January 2012. The participants of this study were 201 postmenopausal Malaysian women aged 45–71 years. Some socio-demographic, lifestyle, and reproductive factors were recorded. Calcaneal BMD was measured by quantitative ultra-sonography. Correlations of reproductive factors with BMD were assessed by Pearson’s correlation test and multiple regression analysis. Age at menopause was not significantly correlated with BMD, while the years after menopause, age at the first menstrual period, number of pregnancies, and total lactation periods were inversely correlated with it. Among reproductive factors, only the association between lactation duration and BMD remained significant after adjusting for age, body mass index, activity, and calcium intake. The results indicated that except for prolonged total time of lactation, other reproductive factors were not significantly associated with BMD in postmenopausal women.

Does primary lactase deficiency reduce bone mineral density in postmenopausal women? A systematic review and meta-analysis.

Postmenopausal osteoporosis is an important predictor of bone fractures. The purpose of the study was to conduct a systematic review and meta-analysis of association of PLD and bone mineral density (BMD) in postmenopausal women. The electronic databases PubMed, Scopus, and Web of Science were searched over the course of July 2017 for any date of publication without language limitation. Studies were included in the meta-analysis if the diagnosis of PLD was made by genetic testing or H-2 breath tests and the diagnosis of osteoporosis was made by a modern reliable method for BMD measurement. Two investigators conducted a comprehensive, independent review of all the papers. Five of the studies initially identified met the inclusion criteria. We used MOOSE guidelines for abstracting data and assessing data quality and validity. Meta-analysis was performed using the random effects model. Five case-control studies with 2223 participants and 763 lactase-deficient cases fulfilled the inclusion criteria. Meta-analysis showed a significantly higher bone density Z-score in absorbers (mean difference 0.20, CI (0.14-0.27), P = 0.000), with no significant heterogeneity among the studies. Moreover, the Z-score in the vast majority of the measured sites (femoral head, femoral neck, lumbar spine, radius, and Ward's triangle) was significantly higher in absorbers. There was no significant overall difference in BMD in g/cm2 between absorbers and non-absorbers, but a significantly higher BMD using g/cm2 was observed in absorbers in the total hip site. Postmenopausal women with PLD had lower Z-scores at most anatomic sites compared to healthy controls.

Correlation of age at menopause with bone mineral density in post-menopausal women: A prospective study

Background: Osteoporosis is a major public health problem as it is associated with substantial morbidity and socioeconomic burden. Aims and Objective: To correlate the age at menopause with bone mineral density in post menopausal woman. Materials and Methods: Two hundred postmenopausal women were studied at the Department of Obstetrics and Gynaecology, King Georges Medical University, Lucknow, between September 2015 to August 2016. A detailed questionnaire was filled which included details of demographic factors of the patient, detailed reproductive history including parity, number of living children, age at menarche, age at menopause, years since menopause, whether menopause was natural or surgical. BMD was measured in each woman at lumbar spine (L1-L4) by lunar Prodigy dual energy X Ray absorptiometry. Results: A total of 72 (36%) women had osteopenia and remaining 123 (61.5%) had osteoporosis. Only 5 (2.5%) women had normal BMD status. Maximum (n=121) were in the 51-60 years age group. There was no significant relation between age and BMD. Proportion of women with osteoporosis was significantly higher in rural (70.3%) as compared to urban (41.9%) areas (p=0.001). Osteoporosis was seen in 82.6%women with > 4 parity (p=0.049). Mean age of menopause in women with normal BMD, osteopenia and osteoporosis was 44.60, 45.51and 43.85 years respectively. No significant association between period since menopause and BMD status could be seen. No significant association was observed either for total or for any of the BMD strata (p>0.05).With increasing duration since menopause a significant decline in T scores was observed (p=0.023) on overall assessment. However, this association was not significant statistically for different BMD strata (p>0.05). Conclusion: The prevalence of osteoporosis was higher as compared to the world prevalence. The correlation between the age at menopause and BMD was significant in accordance with the various worldwide studies.

Bone mineral density in postmenopausal women

The impacts of various factors on bone mineral density (BMD) differ across diverse population. The aim of this study was to determine the relationship between BMD in the femoral neck (FN) and lumbar spine (LS) with some common clinical, demographic, and biochemical parameters in postmenopausal women. In this cross-sectional case-control study, all postmenopausal women of the Amirkola Health and Ageing Project (AHAP) who performed bone densitometry were included. BMD at FN and LS was measured by DXA method. Data regarding clinical, demographic, and biochemical characteristics were provided. OP was diagnosed by the International Society for Clinical Densitometry criteria. Pearson correlation and multivariate regression analyses with simultaneous adjustment were performed to determine relationship. Five hundred thirty-seven women with mean age of 67.9 ± 6.7 years and mean menopause duration (MD) of 15.8 ± 5.1 years were studied. MD correlated negatively with FNBMD and LS-BMD g/cm 2 ( r = −0.405, P = 0.001 and r = −0.217, P = 0.001). Body mass index (BMI) correlated positively with FN and LS-BMD g/cm 2 ( r = 0.397, P = 0.001 and r = 0.311, P = 0.001). The association of MD with risk of FNOP was stronger than LS-OP. Obesity and metabolic syndrome (MS) and higher serum ferritin reduced the risk of OP at both LS and FN similarly, whereas the impacts of parity, prior fracture, high level of education, and physical activity were significantly different across BMD measurement sites. The results of this study indicated a significant association between OP and MD, obesity, parity, MS, history of fracture, serum ferritin, level of education, and physical activity. However, the direction and the strength of association varied across BMD measurement sites.

Interactions of alcohol and postmenopausal hormone use in regards to mammographic breast density

We investigated the association of alcohol intake with mammographic breast density in postmenopausal women by their hormone therapy (HT) status. This study included 2,100 cancer-free postmenopausal women within the Nurses' Health Study and Nurses' Health Study II cohorts. Percent breast density (PD), absolute dense (DA), and non-dense areas (NDA) were measured from digitized film mammograms using a computer-assisted thresholding technique; all measures were square root transformed. Alcohol consumption was assessed with a food frequency questionnaire (0, < 5, and ≥ 5g/day). Information regarding breast cancer risk factors was obtained from baseline or biennial questionnaires closest to the mammogram date. We used generalized linear regression to examine associations between alcohol and breast density measures in women with no HT history, current, and past HT users. In multivariable analyses, we found no associations of alcohol consumption with PD (p trend = 0.32) and DA (p trend = 0.53) and an inverse association with NDA (β = - 0.41, 95% CI - 0.73, - 0.09 for ≥ 5g/day, p trend < 0.01). In the stratified analysis by HT status, alcohol was not associated with PD in any of the strata. We found a significant inverse association of alcohol with NDA among past HT users (β = - 0.79, 95% CI - 1.51, - 0.07 for ≥ 5g/day, p trend = 0.02). There were no significant interactions between alcohol and HT in relation to PD, DA, and NDA (p interaction = 0.19, 0.42, and 0.43, respectively). Our findings suggest that associations of alcohol with breast density do not vary by HT status.