Preconception Antidiabetic Drugs in Men and Birth Defects in Offspring : A Nationwide Cohort Study.

BACKGROUND: Diabetes reduces semen quality and increasingly occurs during reproductive years. Diabetes medications, such as metformin, have glucose-independent effects on the male reproductive system. Associations with birth defects in offspring are unknown. OBJECTIVE: To evaluate whether the risk for birth defects in offspring varies with preconceptional pharmacologic treatment of fathers with diabetes. DESIGN: Nationwide prospective registry-based cohort study. SETTING: Denmark from 1997 to 2016. PARTICIPANTS: All liveborn singletons from mothers without histories of diabetes or essential hypertension. MEASUREMENTS: Offspring were considered exposed if their father filled 1 or more prescriptions for a diabetes drug during the development of fertilizing sperm. Sex and frequencies of major birth defects were compared across drugs, times of exposure, and siblings. RESULTS: Of 1 116 779 offspring included, 3.3% had 1 or more major birth defects (reference). Insulin-exposed offspring (n = 5298) had the reference birth defect frequency (adjusted odds ratio [aOR], 0.98 [95% CI, 0.85 to 1.14]). Metformin-exposed offspring (n = 1451) had an elevated birth defect frequency (aOR, 1.40 [CI, 1.08 to 1.82]). For sulfonylurea-exposed offspring (n = 647), the aOR was 1.34 (CI, 0.94 to 1.92). Offspring whose fathers filled a metformin prescription in the year before (n = 1751) or after (n = 2484) sperm development had reference birth defect frequencies (aORs, 0.88 [CI, 0.59 to 1.31] and 0.92 [CI, 0.68 to 1.26], respectively), as did unexposed siblings of exposed offspring (3.2%; exposed vs. unexposed OR, 1.54 [CI, 0.94 to 2.53]). Among metformin-exposed offspring, genital birth defects, all in boys, were more common (aOR, 3.39 [CI, 1.82 to 6.30]), while the proportion of male offspring was lower (49.4% vs. 51.4%, P = 0.073). LIMITATION: Information on underlying disease status was limited. CONCLUSION: Preconception paternal metformin treatment is associated with major birth defects, particularly genital birth defects in boys. Further research should replicate these findings and clarify the causation. PRIMARY FUNDING SOURCE: National Institutes of Health.

Development in life expectancy with good and poor cognitive function in the elderly European Population from 2004-05 to 2015.

BACKGROUND: Living not just longer, but also cognitively healthier, and more independent lives is essential if European countries are to cope with the financial challenges that the shifting age composition of Europe's population presents. Here we investigate the change in life expectancy (LE) spent with good and poor cognitive function among older adults across Europe. METHODS: LE with good/poor cognitive function was estimated by the Sullivan Method. Cross-sectional data on cognitive functioning was obtained from 23,213 (wave 1, 2004-05) and 40,874 (wave 6, 2015) 50+-year-olds of the Survey of Health, Ageing and Retirement in Europe (SHARE). Information on mortality was obtained from the Eurostat Database. Results for 70+-year-olds were emphasized. RESULTS: LE with good cognitive function increased with 1.6 years from 10.7 years (95% CI: 10.6-10.9) in 2004-05 to 12.4 years (95% CI: 12.3-12.5) in 2015 for 70+-year-olds. Disparity was observed across sex and region. In 2004-05, a 70+-year-old woman could expect to spend 30.9% (95% CI: 29.4-32.4) of her remaining LE with poor cognitive function compared to 27.7% (95% CI: 26.0 -29.4) for men. In 2015, women (24.4% (95% CI: 23.4-25.3)) had considerably caught up with men (24.8% (95% CI:23.7.25.8)), shifting the pattern in favor of women. In 2004-05 and 2015, Northern Europeans had the lowest LE with poor cognitive function while Southern Europeans had the highest, but made the most improvement during the period. CONCLUSIONS: Overall we find that LE with poor cognitive function has been compressed in the European population of 70+-year-olds.

Spousal order of migration, gender, and hospitalization among immigrants in Denmark.

Background: Certain migration contexts that may help clarify immigrants' health needs are understudied, including the order in which married individuals migrate. Research shows that men, who are healthier than women across most populations, often migrate to a host country before women. Using Danish register data, we investigate descriptive patterns in the order that married men and women arrive in Denmark, as well as whether migration order is related to overnight hospitalizations. Methods: The study base includes married immigrants who lived in Denmark between January 1, 1980 and December 31, 2014 (N = 13,680). We use event history models to examine the influence of spousal migration order on hospitalizations. Results: The order that married individuals arrive in Denmark is indeed highly gendered, with men tending to arrive first, and varies by country of origin. Risk of hospitalization after age 50 does not depend on whether an individual migrated before, after, or at the same time as their spouse among either men or women. However, among those aged 18+, men migrating before their wives are more likely to experience hospitalizations within the first 5 years of arrival. Conclusions: These findings provide the first key insights about gendered migration patterns in Denmark. Although spousal order of migration is not related to overnight hospitalization among women, our findings provide preliminary evidence that men age 18+ who are first to arrive experience more hospitalization events in the following 5 years. Future research should explore additional outcomes and whether other gendered migration contexts are related to immigrants' health.

Healthy life expectancy by frailty state in Europe from 2004 to 2015: findings from SHARE.

BACKGROUND: As populations age, the possible consequences of increased frailty are a major concern for the health sector. Here, we investigate how life expectancy with and without frailty has changed during a 10-11-year-period across Europe. METHODS: The Sullivan method was used to investigate changes in life expectancy with and without frailty in 10 European countries. Frailty status (non-frail, pre-frail and frail) was determined by use of the Survey of Health, Ageing and Retirement in Europe Frailty Instrument (SHARE-FI). Data on frailty prevalence was obtained from 21 698 individuals in wave 1 (2004-05) and 38 859 individuals in wave 6 (2015) of the SHARE. Information on mortality was obtained from the Eurostat Database. RESULTS: In 2015, women aged 70 spent 25.0% (95% CI: 24.0-26.1) of their remaining life expectancy in a frail state, and the number for men was 11.5% (95% CI: 10.7-12.3). Southern Europeans spent 24.2% (95% CI: 22.9-25.4) of their remaining life expectancy in a frail state and the numbers for Central Europeans and Northern Europeans were 17.0% (95% CI: 16.0-17.9) and 12.2% (95% CI: 10.9-13.5), respectively. From 2004-05 to 2015, life expectancy increased by 1.1 years (from 15.3 to 16.4 years) for 70-year-old Europeans. Similarly, non-frail life expectancy increased by 1.1 years (95% CI: 0.8-1.4), whereas no significant changes in life expectancy in frail states were observed. CONCLUSIONS: This study suggests that Europeans today spend more years in a non-frail state than Europeans did 10-11 years ago. Our findings reflect a considerable inequality by gender and region.

Women live longer than men even during severe famines and epidemics.

Women in almost all modern populations live longer than men. Research to date provides evidence for both biological and social factors influencing this gender gap. Conditions when both men and women experience extremely high levels of mortality risk are unexplored sources of information. We investigate the survival of both sexes in seven populations under extreme conditions from famines, epidemics, and slavery. Women survived better than men: In all populations, they had lower mortality across almost all ages, and, with the exception of one slave population, they lived longer on average than men. Gender differences in infant mortality contributed the most to the gender gap in life expectancy, indicating that newborn girls were able to survive extreme mortality hazards better than newborn boys. Our results confirm the ubiquity of a female survival advantage even when mortality is extraordinarily high. The hypothesis that the survival advantage of women has fundamental biological underpinnings is supported by the fact that under very harsh conditions females survive better than males even at infant ages when behavioral and social differences may be minimal or favor males. Our findings also indicate that the female advantage differs across environments and is modulated by social factors.

Parental comorbidity and medication use in the USA: a panel study of 785 000 live births.

STUDY QUESTION: How prevalent is paternal medication use and comorbidity, and are rates of these rising? SUMMARY ANSWER: Paternal medication use and comorbidity is common and rising, similar to trends previously described in mothers. WHAT IS KNOWN ALREADY: Maternal medication use and comorbidity has been rising for the past few decades. These trends have been linked to potential teratogenicity, maternal morbidity and mortality and poorer fetal outcomes. STUDY DESIGN, SIZE, DURATION: This is a Panel (trend) study of 785 809 live births from 2008 to 2016. PARTICIPANTS/MATERIALS, SETTING, METHODS: We used the IBM© Marketscan®™ database to gather data on demographic information and International Classification of Diseases codes and Charlson comorbidity index (CCI) during the 12 months prior to the estimated date of conception for mothers and fathers. We similarly examined claims of prescriptions in the 3 months prior to conception. We performed companion analyses of medications used for >90 days in the 12 months prior to conception and of any medication use in the 12 months prior to conception. MAIN RESULTS AND THE ROLE OF CHANCE: We confirmed that both maternal medication use and comorbidity (e.g. hypertension, diabetes, hyperlipidemia) rose over the study period, consistent with prior studies. We found a concurrent rise in both paternal medication use 3 months prior to conception (overall use, 31.5-34.9% during the study period; P < 0.0001) and comorbidity (CCI of ≥1 and 10.6-18.0% over study period; P < 0.0001). The most common conditions seen in the CCI were chronic obstructive pulmonary disease for mothers (6.6-11.6%) and hyperlipidemia for fathers (8.6-13.7%). Similar trends for individual medication classes and specific comorbidities such as hypertension, diabetes and hyperlipidemia were also seen. All primary result trends were statistically significant, making the role of chance minimal. LIMITATIONS, REASONS FOR CAUTION: As this is a descriptive study, the clinical impact is uncertain and no causal associations may be made. Though the study uses a large and curated database that includes patients from across the USA, our study population is an insured population and our findings may not be generalizable. Mean parental age was seen to slightly increase over the course of the study (<1 year) and may be associated with increased comorbidity and medication use. WIDER IMPLICATIONS OF THE FINDINGS: As parental comorbidity and certain medication use may impact fecundability, temporal declines in parental health may impact conception, pregnancy and fetal outcomes. STUDY FUNDING/COMPETING INTEREST(S): None. TRIAL REGISTRATION NUMBER: N/A.

Rethinking morbidity compression.

Studies of morbidity compression routinely report the average number of years spent in an unhealthy state but do not report variation in age at morbidity onset. Variation was highlighted by Fries (1980) as crucial for identifying disease postponement. Using incidence of first hospitalization after age 60, as one working example, we estimate variation in morbidity onset over a 27-year period in Denmark. Annual estimates of first hospitalization and the population at risk for 1987 to 2014 were identified using population-based registers. Sex-specific life tables were constructed, and the average age, the threshold age, and the coefficient of variation in age at first hospitalization were calculated. On average, first admissions lasting two or more days shifted towards older ages between 1987 and 2014. The average age at hospitalization increased from 67.8 years (95% CI 67.7-67.9) to 69.5 years (95% CI 69.4-69.6) in men, and 69.1 (95% CI 69.1-69.2) to 70.5 years (95% CI 70.4-70.6) in women. Variation in age at first admission increased slightly as the coefficient of variation increased from 9.1 (95% CI 9.0-9.1) to 9.9% (95% CI 9.8-10.0) among men, and from 10.3% (95% CI 10.2-10.4) to 10.6% (95% CI 10.5-10.6) among women. Our results suggest populations are ageing with better health today than in the past, but experience increasing diversity in healthy ageing. Pensions, social care, and health services will have to adapt to increasingly heterogeneous ageing populations, a phenomenon that average measures of morbidity do not capture.

Progression of the smoking epidemic in high-income regions and its effects on male-female survival differences: a cohort-by-age analysis of 17 countries.

BACKGROUND: Of all lifestyle behaviours, smoking caused the most deaths in the last century. Because of the time lag between the act of smoking and dying from smoking, and because males generally take up smoking before females do, male and female smoking epidemiology often follows a typical double wave pattern dubbed the 'smoking epidemic'. How are male and female deaths from this epidemic differentially progressing in high-income regions on a cohort-by-age basis? How have they affected male-female survival differences? METHODS: We used data for the period 1950-2015 from the WHO Mortality Database and the Human Mortality Database on three geographic regions that have progressed most into the smoking epidemic: high-income North America, high-income Europe and high-income Oceania. We examined changes in smoking-attributable mortality fractions as estimated by the Preston-Glei-Wilmoth method by age (ages 50-85) across birth cohorts 1870-1965. We used these to trace sex differences with and without smoking-attributable mortality in period life expectancy between ages 50 and 85. RESULTS: In all three high-income regions, smoking explained up to 50% of sex differences in period life expectancy between ages 50 and 85 over the study period. These sex differences have declined since at least 1980, driven by smoking-attributable mortality, which tended to decline in males and increase in females overall. Thus, there was a convergence between sexes across recent cohorts. While smoking-attributable mortality was still increasing for older female cohorts, it was declining for females in the more recent cohorts in the US and Europe, as well as for males in all three regions. CONCLUSIONS: The smoking epidemic contributed substantially to the male-female survival gap and to the recent narrowing of that gap in high-income North America, high-income Europe and high-income Oceania. The precipitous decline in smoking-attributable mortality in recent cohorts bodes somewhat hopeful. Yet, smoking-attributable mortality remains high, and therefore cause for concern.

Associations between perceived information needs and anxiety/depressive symptoms among cancer caregivers: A cross-sectional study.

Purpose: Caregivers to cancer patients often experience information needs. This study investigates the associations between perceived information needs and anxiety/depressive symptoms among caregivers to cancer patients.Design: Cross-sectional study using self-completed questionnaires.Sample: A total of 128 caregivers to cancer patients who participated in a rehabilitation stay at REHPA, The Danish Knowledge Center for Rehabilitation and Palliative Care, from April 2016 to March 2017.Methods: The caregivers completed a questionnaire assessing both information needs and anxiety/depressive symptoms. We used ordinal logistic regressions to estimate odds ratios (ORs) and 95% confidence intervals (CIs) for the associations between seven information needs and anxiety/depressive symptoms. The reference group was caregivers with no perceived information needs.Findings: The combined score of perceived information needs was associated with higher odds of anxiety (OR = 3.86 per unit increase, 95% CI 1.85-8.03) and depressive symptoms (OR = 3.83 per unit increase, 95% CI 1.15-12.75). For the individual items, our results showed higher odds of anxiety symptoms for caregivers with perceived information needs regarding (1) the disease and its course, for both little need for information (OR = 3.62, 95% CI 1.39-9.43) and substantial need for information (OR = 4.57, 95% CI 1.40-14.93); however, for substantial information needs, an interaction with gender was found showing higher odds for men (OR = 28.90, 95% CI 4.46-187.41), but no significant association for women. Also, substantial need for information regarding the disease and its course were associated with higher odds of depressive symptoms (OR = 11.43, 95% CI 1.18-111.21). Furthermore, we found higher odds of anxiety symptoms for caregivers who perceived information needs regarding (2) which symptoms and adverse effects to be aware of; (3) how to help and support a cancer patient; (4) expected mental responses in a person with cancer; (5) how to find information on the internet, and (6) where to direct caregiver questions and/or concerns after patient discharge.Conclusions: Among caregivers to cancer patients, perceived needs regarding the disease and its course were associated with higher odds of anxiety and depressive symptoms. Furthermore, several other information needs were associated with anxiety symptoms.Implications for Psychosocial Providers or Policy: To prevent unnecessary anxiety and depressive symptoms among cancer caregivers, health care professionals should be aware of the importance of informing caregivers regarding the disease and its course. Other issues to address concerning anxiety symptoms are information regarding which symptoms and adverse effects to be aware of; how to help and support a cancer patient; expected mental responses in a person with cancer; how to find information on the internet; and where to direct caregiver questions and/or concerns after patient discharge.

Gender differences in cognitive function and grip strength: a cross-national comparison of four European regions.

BACKGROUND: Cross-national comparison studies on gender differences have mainly focussed on life expectancy, while less research has examined differences in health across countries. We aimed to investigate gender differences in cognitive function and grip strength over age and time across European regions. METHODS: We performed a cross-sectional study including 51 292 men and 62 007 women aged 50 + participating in the Survey of Health, Ageing and Retirement in Europe between 2004-05 and 2015. Linear regression models were used to examine associations. RESULTS: In general, women had better cognitive function than men, whereas men had higher grip strength measures. Sex differences were consistent over time, but decreased with age. Compared with men, women had higher cognitive scores at ages 50-59, corresponding to 0.17 SD (95% CI 0.14, 0.20) but slightly lower scores at ages 80-89 (0.08 SD, 95% CI 0.14, 0.00). For grip strength, the sex difference decreased from 18.8 kg (95% CI 18.5, 19.1) at ages 50-59 to 8.5 kg (95% CI 7.1, 9.9) at age 90 + . Northern Europeans had higher cognitive scores (19.6%) and grip strength measures (13.8%) than Southern Europeans. Gender differences in grip strength were similar across regions, whereas for cognitive function they varied considerably, with Southern Europe having a male advantage from ages 60-89. CONCLUSION: Our results illustrate that gender differences in health depend on the selected health dimension and the age group studied, and emphasize the importance of considering regional differences in research on cognitive gender differences.

Rise, stagnation, and rise of Danish women's life expectancy.

Health conditions change from year to year, with a general tendency in many countries for improvement. These conditions also change from one birth cohort to another: some generations suffer more adverse events in childhood, smoke more heavily, eat poorer diets, etc., than generations born earlier or later. Because it is difficult to disentangle period effects from cohort effects, demographers, epidemiologists, actuaries, and other population scientists often disagree about cohort effects' relative importance. In particular, some advocate forecasts of life expectancy based on period trends; others favor forecasts that hinge on cohort differences. We use a combination of age decomposition and exchange of survival probabilities between countries to study the remarkable recent history of female life expectancy in Denmark, a saga of rising, stagnating, and now again rising lifespans. The gap between female life expectancy in Denmark vs. Sweden grew to 3.5 y in the period 1975-2000. When we assumed that Danish women born 1915-1945 had the same survival probabilities as Swedish women, the gap remained small and roughly constant. Hence, the lower Danish life expectancy is caused by these cohorts and is not attributable to period effects.

Potential gains in life expectancy by reducing inequality of lifespans in Denmark: an international comparison and cause-of-death analysis.

BACKGROUND: Reducing lifespan inequality is increasingly recognized as a health policy objective. Whereas lifespan inequality declined with rising longevity in most developed countries, Danish life expectancy stagnated between 1975 and 1995 for females and progressed slowly for males. It is unknown how Danish lifespan inequality changed, which causes of death drove these developments, and where the opportunities for further improvements lie now. METHODS: We present an analytical strategy based on cause-by-age decompositions to simultaneously analyze changes in Danish life expectancy and lifespan inequality from 1960 to 2014, as well as current Swedish-Danish differences. RESULTS: Stagnation in Danish life expectancy coincided with a shorter period of stagnation in lifespan inequality (1975-1990). The stagnation in life expectancy was mainly driven by increases in cancer and non-infectious respiratory mortality at higher ages (-.63 years) offsetting a reduction in cardiovascular and infant mortality (+ 1.52 years). Lifespan inequality stagnated because most causes of death did not show compression over the time period. Both these observations were consistent with higher smoking-related mortality in Danes born in 1919-1939. After 1995, life expectancy and lifespan equality increased in lockstep, but still lag behind Sweden, mainly due to infant mortality and cancer. CONCLUSIONS: Since 1960, Danish improvements in life expectancy and lifespan equality were halted by smoking-related mortality in those born 1919-1939, while also reductions in old-age cardiovascular mortality held back lifespan equality. The comparison with Sweden suggests that Denmark can reduce inequality in lifespans and increase life expectancy through a consistent policy target: reducing cancer and infant mortality.

Semen Quality as a Predictor of Subsequent Morbidity: A Danish Cohort Study of 4,712 Men With Long-Term Follow-up.

Semen quality has been suggested to be a biological marker of long-term morbidity and mortality; however, few studies have been conducted on this subject. We identified 5,370 men seen for infertility at Frederiksberg Hospital, Denmark, during 1977-2010, and 4,712 of these men were followed in the Danish National Patient Registry until first hospitalization, death, or the end of the study. We classified patients according to hospitalizations and the presence of cardiovascular disease, diabetes, testicular cancer, or prostate cancer. We found a clear association between sperm concentration below 15 million/mL and all-cause hospitalizations (hazard ratio = 1.5, 95% confidence interval: 1.4, 1.6) and cardiovascular disease (hazard ratio = 1.4, 95% confidence interval: 1.2, 1.6), compared with men with a concentration above 40 million/mL. The probabilities for hospitalizations were also higher with a low total sperm count and low motility. Men with a sperm concentration of 195-200 million/mL were, on average, hospitalized for the first time 7 years later than were men with a sperm concentration of 0-5 million/mL. Semen quality was associated with long-term morbidity, and a significantly higher risk of hospitalization was found, in particular for cardiovascular diseases and diabetes mellitus. Our study supports the suggestion that semen quality is a strong biomarker of general health.

Religiousness and health in Europe.

Recent research suggests that epidemiological forces in religion and health can have opposed effects. Using longitudinal data of people aged 50+ included in wave 1 (2004-2005) of the Survey of Health, Ageing and Retirement in Europe (SHARE), and followed up through waves 2 (2006-2007), 4 (2011) and 5 (2013), we examined two forms of religious internalization and their association with health. Multivariate logistic regressions were used to examine all associations. Taking part in a religious organization was associated with lower odds of GALI (global activity limitation index) (OR = 0.86, 95% CI 0.75, 0.98) and depressive symptoms 0.80 (95% CI 0.69, 0.93), whereas being religiously educated lowered odds of poor self-rated health (SRH) 0.81 (95% CI 0.70, 0.93) and long-term health problems 0.84 (95% CI 0.74, 0.95). The more religious had lower odds of limitations with activities of daily living 0.76 (95% CI 0.58, 0.99) and depressive symptoms 0.77 (95% CI 0.64, 0.92) than other respondents, and compared to people who only prayed and did not have organizational involvement, they had lower odds of poor SRH 0.71 (95% CI 0.52, 0.97) and depressive symptoms 0.66 (95% CI 0.50, 0.87). Conversely, people who only prayed had higher odds of depressive symptoms than non-religious people 1.46 (95% CI 1.15, 1.86). Our findings suggest two types of religiousness: 1. Restful religiousness (praying, taking part in a religious organization and being religiously educated), which is associated with good health, and 2. Crisis religiousness (praying without other religious activities), which is associated with poor health.

Comparison of non-parametric methods for ungrouping coarsely aggregated data.

BACKGROUND: Histograms are a common tool to estimate densities non-parametrically. They are extensively encountered in health sciences to summarize data in a compact format. Examples are age-specific distributions of death or onset of diseases grouped in 5-years age classes with an open-ended age group at the highest ages. When histogram intervals are too coarse, information is lost and comparison between histograms with different boundaries is arduous. In these cases it is useful to estimate detailed distributions from grouped data. METHODS: From an extensive literature search we identify five methods for ungrouping count data. We compare the performance of two spline interpolation methods, two kernel density estimators and a penalized composite link model first via a simulation study and then with empirical data obtained from the NORDCAN Database. All methods analyzed can be used to estimate differently shaped distributions; can handle unequal interval length; and allow stretches of 0 counts. RESULTS: The methods show similar performance when the grouping scheme is relatively narrow, i.e. 5-years age classes. With coarser age intervals, i.e. in the presence of open-ended age groups, the penalized composite link model performs the best. CONCLUSION: We give an overview and test different methods to estimate detailed distributions from grouped count data. Health researchers can benefit from these versatile methods, which are ready for use in the statistical software R. We recommend using the penalized composite link model when data are grouped in wide age classes.

Why did Danish women's life expectancy stagnate? The influence of interwar generations' smoking behaviour.

The general health status of a population changes over time, generally in a positive direction. Some generations experience more unfavourable conditions than others. The health of Danish women in the interwar generations is an example of such a phenomenon. The stagnation in their life expectancy between 1977 and 1995 is thought to be related to their smoking behaviour. So far, no study has measured the absolute effect of smoking on the mortality of the interwar generations of Danish women and thus the stagnation in Danish women's life expectancy. We applied a method to estimate age-specific smoking-attributable number of deaths to examine the effect of smoking on the trends in partial life expectancy of Danish women between age 50 and 85 from 1950 to 2012. We compared these trends to those for women in Sweden, where there was no similar stagnation in life expectancy. When smoking-attributable mortality was excluded, the gap in partial life expectancy at age 50 between Swedish and Danish women diminished substantially. The effect was most pronounced in the interwar generations. The major reason for the stagnation in Danish women's partial life expectancy at age 50 was found to be smoking-related mortality in the interwar generations.

Recurrent Primary Spontaneous Pneumothorax is Common Following Chest Tube and Conservative Treatment.

INTRODUCTION: Previous studies on primary spontaneous pneumothorax reported variable recurrence rates, but they were based on heterogeneous patient populations including secondary pneumothorax. We investigated young patients with primary spontaneous pneumothorax exclusively and used a national registry to track readmissions and calculate independent predictors of recurrence. METHODS: A prospective cohort study of consecutive young patients who were admitted over a 5-year period with their first episode of primary spontaneous pneumothorax and treated conservatively with a chest tube. Baseline characteristics were obtained from questionnaires presented on admittance. All patients were discharged with fully expanded lungs on chest radiography. Patient charts were identified in the national electronic patient registry for detailed information on readmissions due to recurrent spontaneous pneumothorax. RESULTS: We included 234 patients. Male/female = ratio 5/1. After a median observation period of 3.6 years (range 1-6 years), recurrent pneumothorax was observed in 54 %. Ipsilateral recurrence was the most common (79 %) but 30 % also experienced contralateral pneumothorax during the study period. Females had a significantly higher age at debut (p < 0.01) and experienced significantly more recurrences over time (p < 0.01). Low body weight (<60 kg) was an independent predictor of recurrence and patients with repeated recurrences were significantly younger at debut (p = 0.01). CONCLUSIONS: Primary spontaneous pneumothorax in younger patients with their first episode had a much higher recurrence rate than previously reported. Every doctor who treats patients with primary spontaneous pneumothorax should be aware and patients informed.

Differences in Religiousness in Opposite-Sex and Same-Sex Twins in a Secular Society.

Sex differences in religion are well known, with females generally being more religious than males, and shared environmental factors have been suggested to have a large influence on religiousness. Twins from opposite-sex (OS) and same-sex (SS) pairs may differ because of a dissimilar psycho-social rearing environment and/or because of different exposures to hormones in utero. We hypothesized that OS females may display more masculine patterns of religiousness and, vice versa, that OS males may display more feminine patterns. We used a web-based survey conducted in Denmark, which is a secular society. The survey included 2,997 twins aged 20-40 years, identified through the population-based Danish Twin Registry. We applied la Cour and Hvidt's adaptation of Fishman's three conceptual dimensions of meaning: Cognition, Practice, and Importance, and we used Pargament's measure of religious coping (RCOPE) for the assessment of positive and negative religious coping patterns. Differences between OS and SS twins were investigated using logistic regression for each sex. The analyses were adjusted for dependence within twin pairs. No significant differences in religiousness and religious coping were found for OS and SS twins except that more OS than SS females were members of the Danish National Evangelical Lutheran Church and fewer OS than SS females were Catholic, Muslim, or belonged to other religious denominations. Moreover, OS males at age 12 had higher rates of church attendance than did SS males. This study did not provide evidence for masculinization of female twins with male co-twins with regard to religiousness. Nor did it show any significant differences between OS and SS males except from higher rates of church attendance in childhood among males with female co-twins.

Parental age at delivery and a man's semen quality.

STUDY QUESTION: Is parental age at delivery associated with a man's semen quality? SUMMARY ANSWER: In this large register-based study both mother's and father's age are found to have minimal effects on semen quality in men. WHAT IS KNOWN ALREADY: Both maternal and paternal age have been associated with a range of adverse health effects in the offspring. Given the varied health effects of parental age upon offspring, and the sensitivity of genital development to external factors, it is plausible that the age of a man's mother and father at conception may impact his reproductive health. To our knowledge this is the first examination of the effects of parental age on semen quality. STUDY DESIGN, SIZE, DURATION: A retrospective cohort study of 10 965 men with semen data and parental data. PARTICIPANTS/MATERIALS, SETTING, METHODS: The study was based on Danish men referred to the Copenhagen Sperm Analysis Laboratory due to infertility in their partnership. Men born from 1960 and delivering a semen sample until year 2000 were included. The men were linked to the Danish Civil Registration System to obtain information on parent's age at delivery. Logistic regression analyses were used to calculate odds ratios and 95% confidence intervals for impaired semen quality. Linear regression analyses were used to examine a relationship between semen parameters and paternal age. MAIN RESULTS AND THE ROLE OF CHANCE: There were no convincing effect of either mother's or father's age on a man's semen quality. As no trends were noted, the few statistically significant results are likely attributable to chance. LIMITATIONS, REASONS FOR CAUTION: Information regarding individual subject characteristics which may impact sperm production (i.e. smoking, BMI) were not available. While our sample size was large, we cannot exclude the possibility that a trend may have been identified with a still larger sample. In addition, the Danish Civil Registration System is merely administrative and hence does not discriminate between biological and adopted children. However, the low rate of adoption (≈2%) suggests that misclassification would have a minimal impact. The men were all referred to the laboratory for infertility problems in their partnership and, therefore, do not represent the general population. We, however, compared semen quality among men within the cohort, and it is therefore less important whether they, in fact, represent the general population. WIDER IMPLICATIONS OF THE FINDINGS: The current study found no link between parental age and a son's semen quality, suggesting other factors may explain recent impairments in men's reproductive health. STUDY FUNDING/COMPETING INTEREST(S): This work was supported by the Hans and Nora Buchard's Fund and the Kirsten and Freddy Johansen's Fund. No competing interests. TRIAL REGISTRATION NUMBER: Not relevant.