Education, Other Socioeconomic Characteristics Across the Life Course, and Fertility Among Finnish Men

Diverse pathways to permanent childlessness in Singapore: A latent class analysis

The proportions of adults reaching midlife without having children have been rising rapidly across the globe, particularly in Asia. However, little is known about the pathways to permanent childlessness within the region's childless population. This study utilized latent class analysis (LCA) to typologize pathways to childlessness based on dynamic characteristics of multiple life domains (i.e., partnership, education, and occupation) among 489 childless Singaporeans aged 50 and above from a 2022 nationwide survey. Additionally, we utilized multinomial logistic regressions to examine the sociodemographic correlates of pathway profiles and Shannon's entropy index to assess the heterogeneity in pathways to childlessness among successive cohorts. Results revealed five distinct profiles of pathways to childlessness: the Never-Married Semi-Professionals, the Low-Flex Blue-Collars, the Highly Educated Professionals, the Ever-Married Semi-Professionals, and the Flexible Blue-Collars. These pathway profiles were significantly associated with sociodemographic characteristics such as gender and family background. Women's pathways to childlessness were more standardized and heavily influenced by partnership characteristics, compared to those of men. The childless from privileged family background were less likely to follow pathways characterized by disadvantageous education and occupational status. There were also rising trends of voluntary childlessness among married childless individuals and increasing heterogeneity in pathways to childlessness across successive birth cohorts. In sum, our findings are consistent with some of the predictions of the Second Demographic Transition theory, suggesting that Singapore may be experiencing a demographic transition characterized by rising childlessness, decoupling of marriage and childbearing, and de-standardization of the life course.

Gendered Parenthood-Employment Gaps from Midlife: A Demographic Perspective Across Three Different Welfare Systems

Women's labor force participation has increased in Western countries, but gender gaps remain, especially among parents. Using a novel comparative perspective, we assess women's and men's employment trajectories from midlife onward by parity and education. We provide insights into the gendered parenthood-employment gaps examining the long-term implications of parenthood beyond the core childbearing ages by decomposing years lived between ages 40-74, in years of employment, joblessness, and retirement. Using multistate incidence-based life tables, we compare different cultural and institutional contexts: Finland, Italy, and the USA. Our results document large cross-national variation, with education playing a key role. In Finland, the number of years of employment increases with parity for women and men, and the gender gap is small; in the USA, the relationship between parity and years of employment is relatively flat, although a gender gap emerges among those with two or more children; in Italy, the number of years of employment decreases sharply for women as parity increases, while it increases for men. Notably, education has a similar positive impact on years of employment across all groups in Finland. In contrast, in the USA and Italy, the gender gap is only half as large among highly educated mothers as it is among low educated mothers. The employment trajectories of childless women and men differ greatly across countries.

Educational experiences and American young adults' childbearing goals: A research note

Objective

This research note describes the relationship between young adults' educational experiences and childbearing goals in the U.S.

Background

In the U.S., education is associated with later childbearing and fewer children, but the relationship between education and fertility desires and intentions is less well-understood. This article contributes to the research literature by illustrating variation in prospective fertility goals by education, focusing on the early life course in order to understand young adults' goals before they have been shaped by parenting and extensive workforce experiences.

Method

This analysis uses data from the National Surveys of Family Growth (1995-2019), a nationally representative survey, to study fertility desires and intentions among childless U.S. men and women ages 19-24. Predicted probabilities demonstrating differences in fertility goals by educational experiences, from three sets of multivariable analyses (logistic regression predicting fertility desires and intentions, separately, and negative binomial regression predicting intended parity), are shown.

Results

Men and women with a bachelor's degree and those enrolled in college do not have lower fertility goals than those without a degree and not enrolled; if anything, more educated individuals are slightly more likely to desire (for men only) and intend children and to have slightly larger intended family size.

Conclusions

Education gaps in fertility in the United States are not attributable to differences in early-life fertility goals.

Parental background and daughters' and sons' educational outcomes - application of the Trivers-Willard hypothesis

This study uses Trivers-Willard hypothesis to explain the differences in daughters' and sons' educational outcomes by parental background. According to the Trivers-Willard hypothesis (TWH), parental support and investments for sons and daughters display an asymmetrical relationship according to parental status because of the different reproductive advantage of the sexes. It predicts that high-status parents support sons more than daughters, and low-status parents support daughters more than sons. In modern societies, where education is the most important mediator of status, the TW hypothesis predicts that sons from high-status families will achieve higher educational outcomes than daughters. Using cohorts born between 1987 and 1997 from the reliable full population Finnish register data that contain the data of over 600.000 individuals, children's educational outcomes were measured using data on school dropout rate, academic grade point average (GPA), and general secondary enrollment in their adolescence. OLS and sibling fixed-effect regression that permitted an examination of opposite-sex siblings' educational outcomes within the same family were applied. Sons with high family income and parental education, compared to daughters of the same family, have lower probability of dropping out of school and are more likely to enroll into academic secondary school track. In families with low parental education or income daughters have lower probability for school dropout and enroll more likely to academic school track related to sons of the same family. The effect of family background by sex can be interpreted to support TWH in dropout and academic school track enrollment but not in GPA.

Comparing reproductive intentions before and during the COVID-19 pandemic: a cross-sectional study

BACKGROUND AND AIM

Reproductive behaviors and intentions are affected by several factors, including the COVID-19 pandemic crisis. This study was conducted with the aim of comparing the intention to reproduce and its causes in Iran during the period prior to and during the COVID-19 pandemic.

METHODS

This descriptive-comparative study included 425 cisgender women from 6 urban health centers and 10 rural centers in Babol city, Mazandaran province, Iran. Urban and rural health centers were selected using a multi-stage approach with proportional allocation. A questionnaire was used to collect data in relation to individual characteristics and reproductive intentions.

RESULTS

Most participants aged between 20 and 29 years had a diploma level of education, were housewives and lived in the city. The intention to reproduce decreased from 11.4% before the pandemic to 5.4% during the pandemic (p = 0.006). The most common reason for wanting to have children prior to the pandemic was not having children (54.2%). During the pandemic, a desire to reach the ideal number of children was the most common reason to want to have children (59.1%), though no statistically significant difference was observed between the two periods (p = 0.303). The most common reason for not wanting to have children in both periods was having enough children already (45.2% before and 40.9% during the pandemic). The reasons for not wanting to have children had a statistically significant difference between the two periods (p < 0.001). Reproductive intentions had a statistically significant relationship with the variables of age (p < 0.001), the education level of both participants (p < 0.001) and spouses (p = 0.006), occupation (p = 0.004), and socio-economic status (p < 0.001).

CONCLUSION

Despite restrictions and lockdowns, the COVID-19 pandemic had a negative impact on people's desire to reproduce in this context. Economic problems caused by the sanctions which increased during the COVID-19 crisis may be one of the reasons for a reduction in people's intentions to become parents. Future research could usefully investigate whether this decrease in the desire to reproduce will lead to significant changes in population level and future birth rates.

Increasing pressure on US men for income in order to find a spouse

In contemporary societies, social status - especially income - is one of the most important determinants of ever marrying among men. Using U.S. census data, we estimated the importance of income for ever marrying among men and women, analyzing birth cohorts from 1890 to 1973. We examined individuals between the ages of 45 and 55, a total of 3.5 million men and 3.6 million women. We find that for men, the importance of income in predicting ever being married increased steadily over time. Income predicted only 2.5% of the variance in ever marrying for those born in 1890-1910, but about 20% for the 1973 cohort. For women, the opposite is true: the higher a woman's income among those born between 1890 and 1910, the lower her odds of ever being married, explaining 6% of the variance, whereas today a woman's income no longer plays a role in ever being married. Thus, our results provide evidence that income may represent a very recent selection pressure on men in the US, a pressure that has become increasingly stronger over time in the 20th and early 21st centuries.

'Baby mamas' in Urban Ghana: an exploratory qualitative study on the factors influencing serial fathering among men in Accra, Ghana

BACKGROUND

Biological fathering, especially in patrilineal societies, was traditionally acceptable only in the context of marriage to the mother of the child. Many men were polygynous, often staying in one household with all their wives and children. However, this phenomenon has been on the decline in recent times, mainly due to Christianity, which encourages monogamy while frowning on polygyny. The Ghanaian family has for the past few years been undergoing changes due to migration, urbanization, and industrialization. With an increase in non-marital births and the dissolution of marital unions, multi-partner fertility is likely to increase. Contemporary Ghanaian perspectives on the circumstances that lead men to engage in paternal multi-partner fertility, otherwise referred to in this study as serial fathering, are scanty, hence this study examines the factors that lead to serial fathering among Ghanaian men.

METHODS

The study employed the qualitative method, using in-depth interviews with twenty (20) serial fathers and a focus group discussion with seven (7) women.

RESULTS

It was found that factors such as the attitude of women in relationships, the duolocal post-marital residential pattern, and the age at first birth are some of the reasons why some men father children with multiple partners.

CONCLUSION

The study concludes that both situational and personal factors account for the phenomenon of serial fathering amongst men in Prampram, Ghana, and these factors bring about distinctions in serial fathering as occurring either within or outside of marriage.

Association between depression and the likelihood of having children: a nationwide register study in Finland

BACKGROUND

Depression may be associated with a lower likelihood of having children, but the findings are inconsistent. Previous population-based studies on this topic are limited.

OBJECTIVE

We examined associations between depression and the likelihood of having children, the number of children, and the parental age at first birth. We also evaluated whether these associations differ for people with low, middle, and high educational levels.

STUDY DESIGN

We conducted a nationwide register cohort study including all individuals born in Finland from 1960 to 1980 (n=1,408,951). Depression diagnoses were identified from the Care Register for Health Care (containing records of inpatient hospital episodes for the period 1969 to 2017 and of specialist outpatient visits for the period 1996 to 2017). The main outcomes-having biological children, the number of biological children, and the parental age at first birth-were identified from the Population Register of Statistics Finland and were defined either in the last year of the follow-up in 2017 or the last year alive or living in Finland. The association between depression and the likelihood of having children was examined using a logistic regression analysis; the association between depression and the number of children was evaluated using Poisson regression analyses, and the association between depression and the age at first birth was evaluated using a linear regression analysis. All analyses were conducted separately for men and women.

RESULTS

For both men and women, secondary care-treated depression was associated with a lower likelihood of having children (odds ratio, 0.66; 95% confidence interval, 0.64-0.67 for men; odds ratio, 0.84; 95% confidence interval, 0.82-0.85 for women) and with having fewer children (incidence rate ratio, 0.86; 95% confidence interval, 0.86-0.87 for men; incidence rate ratio, 0.96; 95% confidence interval, 0.96-0.96 for women). Depression was associated with a slightly lower parental age at first birth (33.1 vs 34.0; P<.001 for men; 31.3 vs 32.1; P<.001 for women). Dose-response associations between the severity of depression and a decreased likelihood of having children, as well as having fewer children, were observed. Earlier onset of depression was related to a lower likelihood of having children and to having fewer children. Among men and women in middle- and high-level educational groups, depression was associated with a lower likelihood of having children and with having fewer children. Among men with a low level of education, no associations were observed. Among women with a low level of education, depression was associated with a higher likelihood of having children and with having more children.

CONCLUSION

Both men and women with secondary care-treated depression have a lower likelihood of having children and have fewer children. Our findings suggest that depression may be one of the factors that contribute to the likelihood of having children, which should be addressed by policy makers.

Less Is More? Repartnering and Completed Cohort Fertility in Finland

An extensive literature theorizes the role of repartnering for cohort fertility and whether union dissolution can be an engine for fertility. A large share of higher order unions are nonmarital cohabitations, but most previous studies on completed cohort fertility have analyzed only marital unions, and none have incorporated nonmarital cohabitations using population-level data. To analyze the relationship between the number of unions and cohort fertility for men and women, we use Poisson regression with Finnish register data to enumerate every birth, marriage, and cohabitation among the 1969-1972 birth cohorts at ages 18-46. We show that dissolutions of first cohabitations are the main pathway to repartnering and that most higher order unions are cohabitations. Nonmarital repartnering is a strong predictor of low fertility. In contrast, remarriage is positively associated with cohort fertility. Because the bulk of first-union dissolutions and higher order unions are nonmarital, repartnering is not an efficient engine for fertility at the aggregate level. Marriage and cohabitation are far from indistinguishable in a country often described as a second demographic transition forerunner.

Sexually antagonistic selection on educational attainment and body size in Estonian children

Natural selection is a key mechanism of evolution, which results from the differential reproduction of phenotypes. We describe fecundity selection at different parity transitions on 15 anthropometric traits and educational attainment in Estonian children sampled in the middle of 20th century. The direction of selection on educational attainment and bodily traits was sexually antagonistic, and it occurred via different parity transitions in boys and girls. Compared to boys with primary education, obtaining tertiary education was associated with 3.5 times and secondary education two times higher odds of becoming a father. Transition to motherhood was not related to educational attainment, while education above primary was associated with lower odds (OR = 0.5-0.7) to progression to parities above one and two. Selection on anthropometric traits occurred almost exclusively via childlessness in boys, while among the girls, most of the traits that were associated with becoming a mother were additionally associated with a transition from one child to higher parities. Male (but not female) fitness was thus primarily determined by traits related to mating success. Selection favored stronger and larger boys and smaller girls. Selection on girls favored some traits that associate with perceived femininity, while other feminine traits were selected against.

Less Partnering, Less Children, or Both? Analysis of the Drivers of First Birth Decline in Finland Since 2010

In the 2010s, fertility has declined in the Nordic countries, most strikingly in Finland, and first births drive the decline. It remains unclear whether this decline results from decreased fertility within unions, changing union dynamics, or both. Thus, we investigated changes in the union–first birth dynamics from 2000 through 2018 in Finland using full-coverage population register data and an incidence-based multistate model. To do so, we calculated the yearly age-specific transition probabilities across states of single, cohabitation, marriage, and first births among 15- to 45-year-old childless men and women. We found lower fertility rates in unions after 2010, increasing dissolution rates amongst cohabiting couples, and long-term declines in the transition to marriage. Counterfactual simulations showed that, for the decline in first births since 2010, fertility within unions matters more (three-quarters) than union dynamics (one-quarter): that is, lower fertility in cohabitating and married individuals explained 42% and 13% of the decline, respectively, and decreasing fertility rates among couples entering cohabitation explained a further 17%. Decreasing marriage (19%) and cohabitation rates (2–4%) as well as higher union dissolution rates (6%) explained a smaller share of the first birth decline. The decline in first births was somewhat sharper among the lower social strata, but across strata the decreasing first birth transitions in unions explained most of the decline. To conclude, while changing union dynamics provide a partial explanation, postponing or foregoing fertility within unions represents the primary reason for the fertility decline.

Desired Fertility and Educational Aspirations: Adolescent Goals in Rapidly Changing Social Contexts

Objective

This article analyzes the relationship between educational aspirations and fertility aspirations early in the life course in three different settings.

Background

The negative relationship between women's educational attainment and childbearing is one of the most consistent associations in social science. Family scholars have a more limited understanding of the relationship between educational aspirations and fertility aspirations before childbearing or union formation.

Method

The authors use data collected in Jalisco, Mexico; Gaza, Mozambique; and Chitwan Valley, Nepal as part of the Family Migration and Early Life Outcomes project. They estimate nested Poisson regressions to model the relationship between adolescent educational aspirations and desired family size, controlling for individual- and household-level sociodemographic variables as well as adolescent beliefs and values.

Results

On average, adolescents who desire more education want fewer children in unadjusted models. In Mozambique and Nepal, this association is attenuated in models accounting for household characteristics. In Mexico, the association persists after incorporating these factors, but the inclusion of individual aspirations attenuates the relationship between educational aspirations and desired family size. In Mozambique, the association of educational aspirations with desired family size is moderated by gender.

Conclusion

As young people enter adolescence, their desires for education and childbearing are inversely related, but the mechanisms driving this association vary across contexts. This variation may be related to linkages between education, social status, and family values.

Fatherhood and wage inequality in Britain, Finland, and Germany

OBJECTIVE

This study investigates whether and how fatherhood shapes the wage distribution in Britain, Finland, and Germany.

BACKGROUND

Existing research debates whether fatherhood is associated with greater wages. However, it remains unclear whether the association between fatherhood and wages varies along the wage distribution as well as institutional contexts. To explore this, we compare three countries that differ in their wage bargaining institutions and family policies.

METHOD

We use unconditional quantile regression on longitudinal data from the 1995 to 2016 waves of the Finnish Linked Employer Employee data, German Socio-Economic Panel, and UK Longitudinal Household Study. To control for selection into fatherhood, we combine quantile regressions with fixed effects techniques.

RESULTS

Results show little evidence of substantial fatherhood wage effects along men's wage distribution. In all countries, fathers' higher wages at the median and top of the wage distribution are mostly accounted for by selection, but fatherhood shifts the bottom part of the distribution to the left particularly in the UK.

CONCLUSIONS

The extent to which having a child affects men's wages across the wage distribution is similar across three diverse policy contexts. Yet, differences across the wage distribution are larger in the UK. We argue this may be linked to its higher level of inequality typical of liberal labour markets.

Husband's income, wife's income, and number of biological children in the U.S

Previous studies have found that the positive relationship between personal income and fertility for men in the United States is primarily due to childlessness among low-income men. Yet because of the opposite effects of income on fertility for men and women, it is important to examine the effects of income net of spouse's income. An analysis of income from all sources and biological fertility data for husbands and wives from the Survey of Income and Program Participation (2014) shows that for men their own income is positively associated with the number of their biological children, while their spouse's income is negatively associated with total children ever fathered. The reverse is true for women. These results are not because of childlessness among low-income men and high-income women, but also hold true among all those with children. For men and women aged 45-65, who likely have completed fertility, these results hold regardless of whether or not education is controlled. These findings suggest that if status is measured as personal income for men and husband's income for women, the positive relationship between status and fertility persists in a postdemographic transition society.

Fertility Behavior of Turkish Migrant Men in Europe Compared to Stayers at Origin

This paper addresses the fertility behavior of Turkish men in Europe from a context of origin perspective. Men of the first and subsequent migrant generations are compared with “stayers” from the same regions of origin in Turkey. We pay special attention to the men’s reasons for migration by distinguishing between work and nonwork motivations for migration. We use data from the 2000 Families Study, which was conducted in 2010 and 2011 in Turkey and in western European countries; the sample consists of about 3,500 men. We analyze the transitions to fatherhood as well as to second and third births using event-history analyses; and we investigate the cumulated number of children using Poisson regression analysis. As the men were aged 18–92 at the data collection, we carry out separate models for birth cohort groups. Our findings provide support for the hypothesis of the interrelatedness of events. First-generation migrant men show elevated first birth transitions, which are closely linked to marriage and migration. However, in contrast to the pattern that is often found for women, this effect is observed for labor as well as for nonwork migrants. The rates of transition to a second and a third birth differ less from those of stayers. Analyses of cumulated fertility at age 41 or older further suggest that the migrants’ overall numbers of children are smaller than those of the stayers in Turkey. Thus, our findings indicate that there are dissimilation processes and crossover trends among emigrant men characterized by higher rates of transition to family formation linked to migration but lower overall fertility.

Historical Context Changes Pathways of Parental Influence on Reproduction: An Empirical Test from 20th-Century Sweden

Several studies have found that parental absences in childhood are associated with individuals’ reproductive strategies later in life. However, these associations vary across populations and the reasons for this heterogeneity remain debated. In this paper, we examine the diversity of parental associations in three ways. First, we test whether different kinds of parental availability in childhood and adolescence are associated with women’s and men’s ages at first birth using the intergenerational and longitudinal Uppsala Birth Cohort Study (UBCoS) dataset from Sweden. This cultural context provides a strong test of the hypothesis that parents influence life history strategies given that robust social safety nets may buffer parental absences. Second, we examine whether investments in education help explain why early parental presence is associated with delayed ages at first birth in many post-industrial societies, given that parents often support educational achievement. Third, we compare parental associations with reproductive timing across two adjacent generations in Sweden. This historical contrast allows us to control for many sources of heterogeneity while examining whether changing educational access and norms across the 20th-century change the magnitude and pathways of parental influence. We find that parental absences tend to be associated with earlier first births, and more reliably so for women. Many of these associations are partially mediated by university attendance. However, we also find important differences across cohorts. For example, the associations with paternal death become similar for sons and daughters in the more recent cohort. One possible explanation for this finding is that fathers start influencing sons and daughters more similarly. Our results illustrate that historical changes within a population can quickly shift how family affects life history.

Social class and fertility: A long-run analysis of Southern Sweden, 1922-2015

This paper examines social class differences in fertility, using longitudinal micro-level data for a regional sample in Sweden, 1922-2015. Using discrete-time event history models, we estimated the association between social class and parity-specific duration to next birth, adjusting for household income in separate models. Social class was associated with fertility quite independently from income and the association was both parity-dependent and sex-specific. For transitions to parenthood, higher class position was associated with higher fertility for men and lower fertility for women before 1970, but then converged into a positive association for both sexes after 1990. For continued childbearing, a weak U-shaped relationship before 1947 turned into a positive relationship for second births and a negative relationship for higher-order births in the period after 1990. These patterns likely reflect broader changes in work-family compatibility and are connected to profound shifts in labour markets and institutional arrangements in twentieth-century Sweden.

Sex Differences in the Association of Family and Personal Income and Wealth with Fertility in the United States

Evolutionary theory predicts that social status and fertility will be positively related. It also predicts that the relationship between status and fertility will differ for men and women. This is particularly likely in modern societies given evidence that females face greater trade-offs between status and resource acquisition and fertility than males. This paper tests these hypotheses using newly released data from the 2014 wave of the Survey of Income and Program Participation by the US Census, which has the first complete measures of fertility and number of childbearing partners for a large, representative, national probability sample of men and women and also contains comprehensive measures of economic status as measured by personal and family resources, including income from all sources and all assets. Multivariate analyses show that personal income is positively associated with total fertility and number of childbearing unions for men only. For men, personal net worth is positively associated with number of childbearing unions; it is also positively associated with fertility for married men with a spouse present. These findings support evolutionary predictions of a positive relationship between status, access to mates, and reproductive success for males. Whereas personal income and personal net worth are negatively associated with total fertility and number of childbearing unions for women, family income (net of personal income) is positively associated with total fertility for women. For married men living with a spouse, family income (net of personal income) is negatively associated with total fertility. These findings are consistent with evolutionary theory given the existence of greater trade-offs between production and reproduction for women in an advanced industrial society. For women and men, family net worth (net of personal net worth) is negatively associated with number of childbearing unions and fertility. Implications are discussed.

Effects of wife's and husband's income on wife's reproduction: an evolutionary perspective on human mating

From an evolutionary perspective, for women mate choice may be of crucial importance particularly concerning resources needed for rearing children. In modern societies, however, resources in terms of income are often provided by both women and men. Nonetheless, the effects of a wife's and husband's socioeconomic status on the wife's reproduction have not been investigated on a broader level. We therefore aim to investigate the effects of wife's and husband's income on wife's number of children and her probability of remaining childless using census data from nine countries mainly in the developing world for a total of 782,147 women aged 45-54 years who currently live with a husband and their spouses. Overall, both wife's and husband's income are significantly negatively associated with wife's number of children. Only in Israel do we find a positive association between husband's income and wife's offspring number. A wife's probability of remaining childless, however, increases with increasing own, but decreases with increasing husband's income. We conclude that in this sample of nearly all developing countries, effects of husband's socioeconomic status on wife's reproduction are acting through childlessness.

Education, Gender, and Cohort Fertility in the Nordic Countries

Systematic comparisons of fertility developments based on education, gender and country context are rare. Using harmonized register data, we compare cohort total fertility and ultimate childlessness by gender and educational attainment for cohorts born beginning in 1940 in four Nordic countries. Cohort fertility (CTF) initially declined in all four countries, although for cohorts born in the 1950s and later, the CTF remained stable or declined only modestly. Childlessness, which had been increasing, has plateaued in Denmark, Norway and Sweden. Women's negative educational gradient in relation to total fertility has vanished, except in Finland, while men's positive gradient has persisted. The highest level of men's childlessness appears among the least educated. In the oldest female cohorts, childlessness was highest among the highly educated, but these patterns have changed over the cohorts as childlessness has increased among the low educated and remained relatively stable among higher educated women. In Denmark, Norway and Sweden, childlessness is now highest among the least educated women. We witness both a new gender similarity and persistent (among men) and new (among women) educational disparities in childbearing outcomes in the Nordic region. Overall, the number of low educated has decreased remarkably over time. These population segments face increasing social and economic disadvantages that are reflected as well in their patterns of family formation.

Biological, environmental and socioeconomic determinants of the human birth sex ratio in the Czech Republic

The Trivers-Willard Hypothesis (TWH) states that parents in good conditions bias the sex ratio towards sons and parents in poor conditions bias the sex ratio towards daughters. This study used data from a large nationwide population dataset (N=1,401,851) from the Czech Republic - a modern contemporary society. The study included air pollution and property prices in the TWH estimation, and had a more detailed focus on stillbirths than previous studies. Using official natality microdata from the Czech Statistical Office for years between 1992 and 2010 and data on levels of air pollution in the country over the same period, the study assessed whether the biological and socioeconomic status of mothers and environmental factors affected the sex of children. The results were largely insignificant and not robust across specifications. The presented epidemiological evidence suggests that stillbirths are randomly distributed in the Czech Republic and that the sex ratio is not affected by the socioeconomic status of mothers or by environmental characteristics.

Trends in Childlessness Among Highly Educated Men in Sweden

Among men with post-secondary degrees in Sweden, one in four are childless by age 45, and this level has been constant over time (in this study, for men born 1956–1972). This high level of childlessness is somewhat surprising in the context of a significant gender imbalance among the highly educated (and thus the relative scarcity of highly educated men). In this study, I examine differences in childlessness among the highly educated by studying how educational prestige, social class, and income are associated with the likelihood of becoming a father. Higher income and social class background are positively associated with fatherhood, and this association has not changed over time. Educational prestige (higher degrees, or degrees from traditional universities) is not positively associated with fatherhood, while 2-year degrees have become more positively associated with fatherhood over time. The findings of this study suggest that socioeconomic resources are important for men's family formation in Sweden compared to educational resources, contrary to expectations from educational homophily and partner market perspectives.