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Publications (10 of 77) Show all publications
Jylhä, K. M., Kolk, M. & Fairbrother, M. (2025). Attitudes towards childbearing, population, and the environment: prevalence, correlates, and connections with fertility outcomes in Sweden. Population and environment, 47(3), Article ID 32.
Open this publication in new window or tab >>Attitudes towards childbearing, population, and the environment: prevalence, correlates, and connections with fertility outcomes in Sweden
2025 (English)In: Population and environment, ISSN 0199-0039, E-ISSN 1573-7810, Vol. 47, no 3, article id 32Article in journal (Refereed) Published
Abstract [en]

Environmental concerns may influence personal fertility decisions and general opinions about childbearing and population dynamics, but research on this topic remains scarce. In two analyses based on large Swedish datasets (the Gender and Generation Survey [GGS], N = 8027, and a survey designed for this project, N = 683), we examine the connection between climate change worry and fertility outcomes and compare the prevalence of various concerns, behaviors, and opinions about the environment, childbearing, and population. We find little evidence that environmental concerns have a notable connection with fertility outcomes, but many people perceive a link between childbearing and environmental problems. Most respondents think environmental considerations should influence people’s decisions to have children—based on considerations regarding both the hypothetical child’s future life conditions and the potential environmental impacts of childbearing—and see global population growth as a problem. A substantial minority thinks that measures should be introduced to limit population size, both domestically and in developing countries. We examine how such eco-reproductive concerns and behaviors vary with key demographic and psychological factors emphasized in previous research on fertility and/or environmentalism. The findings showed that eco-reproductive concerns correlate with attitudinal variables (climate change worry, less climate change denial, conservative attitudes, and low political trust), while eco-reproductive behavior is linked with other forms of environmental behaviors and with life circumstances (being younger, not being in a relationship). Our main conclusion is that environmental considerations are influencing views on population and childbearing, but we see no clear evidence of their impact on childbearing decisions in Sweden.

Keywords
Attitudes, Childbearing decisions, Climate change worry, Demography, Environmental concern, Fertility, Population growth, Sweden
National Category
Demography
Identifiers
urn:nbn:se:su:diva-245650 (URN)10.1007/s11111-025-00503-9 (DOI)001536545700001 ()2-s2.0-105011681237 (Scopus ID)
Available from: 2025-08-21 Created: 2025-08-21 Last updated: 2025-08-21Bibliographically approved
Lindmarker, J., Kolk, M. & Drefahl, S. (2025). Cohabitation and Mortality Across the Life Course: A Longitudinal Cohort Study with Swedish Register-Based Sibling Comparisons. European Journal of Population, 41(1), Article ID 2.
Open this publication in new window or tab >>Cohabitation and Mortality Across the Life Course: A Longitudinal Cohort Study with Swedish Register-Based Sibling Comparisons
2025 (English)In: European Journal of Population, ISSN 0168-6577, E-ISSN 1572-9885, Vol. 41, no 1, article id 2Article in journal (Refereed) Published
Abstract [en]

Research has shown that married individuals live longer lives than unmarried women and men. A smaller number of studies have included non-marital cohabitation and have found that their mortality falls between the married and other unmarried groups. There are indications that the cohabiting population is diverse in terms of mortality risk, yet very little is known about how the association is related to age and stages of the life course. Sweden is a forerunner in family trends, and this is the first study that examines cohabitation and mortality in a Swedish context. Using Swedish register data for the years 2012–2017, we investigated how different partnership statuses are related to mortality for men and women at different ages (N = 5,572,011). We also examine whether the association between cohabitation and mortality is similar after accounting for family-of-origin effects through the use of a sibling comparison design. Our findings confirmed the notion of cohabiters as a diverse group whose relative mortality risk differs depending on the timing of cohabitation. Never-married cohabiters had a mortality risk similar to married couples at younger ages and a gradually increased risk with age. Divorced and widowed cohabiters exhibited an age gradient in the opposite direction. Future research should consider how the context of cohabitation changes across the life course.

Keywords
Civil status, Cohabitation, Mortality, Register data, Sweden
National Category
Demography
Identifiers
urn:nbn:se:su:diva-239782 (URN)10.1007/s10680-024-09722-6 (DOI)001396190100001 ()2-s2.0-85217822517 (Scopus ID)
Available from: 2025-02-28 Created: 2025-02-28 Last updated: 2025-04-29Bibliographically approved
Klein, J., Kolk, M. & Saarela, J. (2025). Life expectancy by religious affiliation in Finland 1972–2020. Demographic Research, 52, 519-534, Article ID 17.
Open this publication in new window or tab >>Life expectancy by religious affiliation in Finland 1972–2020
2025 (English)In: Demographic Research, ISSN 1435-9871, Vol. 52, p. 519-534, article id 17Article in journal (Refereed) Published
Abstract [en]

Background: Religion and religiosity are known as important determinants of health and mortality. Previous studies on the interrelation between religion and mortality have relied on survey data and have mainly been carried out in a North American setting.

Objective: We provide a register-based study of life expectancy by religious affiliation for a total national population over the course of five decades.

Methods: We calculate life expectancy by religious affiliation, using register data on the entire population of Finland for the period 1972–2020. Calculations are made separately for men and women born in Finland and abroad. We use administrative longitudinal annual data on each person’s religious denomination, as registered by the Finnish government.

Results: Orthodox Christians have up to two years shorter life expectancy than members of the Evangelical Lutheran State Church, while people of other religions have up to four years longer life expectancy. Non-affiliated persons have about one-year shorter life expectancy than Evangelical Lutherans, but the difference has decreased over time, and they currently are at a similar level. The pattern of life expectancy is similar for the native- and foreign-born, but sex differences are more pronounced among the latter.

Conclusions: Religious affiliation as measured by population register data is an important determinant of life expectancy.

Contribution: This is the first study of life expectancy by religious affiliation based on population register data for an entire country. We find substantive differences across religious denominations, even in the secular context of Finland.

National Category
Demography
Identifiers
urn:nbn:se:su:diva-246189 (URN)10.4054/DemRes.2025.52.17 (DOI)001449823400001 ()2-s2.0-105009338163 (Scopus ID)
Available from: 2025-08-29 Created: 2025-08-29 Last updated: 2025-11-11Bibliographically approved
Möllborn, S., Kolk, M. & Evertsson, M. (2025). Recent trends in parenthood in Swedish same- and different-sex legal unions: emerging gender and socioeconomic differences. Genus, 81, Article ID 20.
Open this publication in new window or tab >>Recent trends in parenthood in Swedish same- and different-sex legal unions: emerging gender and socioeconomic differences
2025 (English)In: Genus, E-ISSN 2035-5556, Vol. 81, article id 20Article in journal (Refereed) Published
Abstract [en]

Parentalization, or becoming a parent and being legally and socially recognized as such, has long been constrained for sexual minorities. Although many studies have examined the outcomes of children of same-sex couples, relatively less attention has been paid to researching parents in same-sex unions themselves. In Sweden, changing policy and social contexts have successively eased many disparities in access to parenthood for sexual minorities. Analyzing 27 years of Swedish administrative register data starting from the legal recognition of same-sex unions in 1995, we examined time trends in the prevalence of parenthood (coresidence with children under 18) and the sociodemographic characteristics of people with versus without coresident children in same- versus different-sex legal unions. We expected to document considerable changes over time as policy contexts, parentalization disparities, and minority stressors evolved. Results show that parenting increased over time within same-sex legal unions, with women becoming much more likely to parent while parenting remained rare in male-male legal unions. Mothers in same-sex legal unions became more similar over time to mothers in different-sex marriages, whereas fathers in same-sex legal unions were a highly selected group relative to fathers in different-sex marriages, mothers in same- and different-sex legal unions, and people without coresident children in same-sex legal unions. Sex, parenthood, and especially their interaction are important for understanding the characteristics and family formation experiences of people in same-sex legal unions.

Keywords
Demography, LGBQ +, Same-sex marriage, Same-sex parents, Sweden
National Category
Demography
Identifiers
urn:nbn:se:su:diva-245458 (URN)10.1186/s41118-025-00256-1 (DOI)001522710700001 ()2-s2.0-105010090383 (Scopus ID)
Available from: 2025-08-14 Created: 2025-08-14 Last updated: 2025-08-14Bibliographically approved
Wood, J., Marynissen, L., Nisén, J., Fallesen, P., Neels, K., Trimarchi, A., . . . Martikainen, P. (2025). Regional differentiation in women’s educational gradients in fertility around the turn of the century: Urban-rural differences in northern and western Europe. Vienna Yearbook of Population Research, 23
Open this publication in new window or tab >>Regional differentiation in women’s educational gradients in fertility around the turn of the century: Urban-rural differences in northern and western Europe
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2025 (English)In: Vienna Yearbook of Population Research, ISSN 1728-4414, E-ISSN 1728-5305, Vol. 23Article in journal (Refereed) Published
Abstract [en]

Scholars agree that educational gradients in fertility vary by context, with indications of more positive educational gradients in northern and western Europe since the turn of the century. However, despite theoretical and empirical research on rural-urban differences in fertility, our understanding of subnational regional variation and urban-rural differences in the relationship between education and fertility remains limited. Utilising large-scale administrative data from seven countries (Belgium, Denmark, Finland, France, the Netherlands, Norway and Sweden) at around the turn of the century, this study identifies substantial subnational regional differences in the association between female education on the one hand, and birth hazards or synthetic parity progression ratios on the other. With respect to urbanisation, we find that higher shares of foreign-born women in more urbanised populations are associated with more negative educational gradients in fertility. Hence, we present a first descriptive step towards the development of a research agenda to explain regional and urban-rural variation in educational gradients in fertility.

Keywords
Regional variation, Fertility, Education, Administrative data, Europe
National Category
Sociology
Identifiers
urn:nbn:se:su:diva-243850 (URN)10.1553/p-4cgn-nz7f (DOI)2-s2.0-105010963644 (Scopus ID)
Available from: 2025-06-09 Created: 2025-06-09 Last updated: 2025-08-11Bibliographically approved
Abdellaoui, A., Martin, H. C., Kolk, M., Rutherford, A., Muthukrishna, M., Tropf, F. C., . . . Visscher, P. M. (2025). Socio-economic status is a social construct with heritable components and genetic consequences. Nature Human Behaviour, 9(5), 864-876
Open this publication in new window or tab >>Socio-economic status is a social construct with heritable components and genetic consequences
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2025 (English)In: Nature Human Behaviour, E-ISSN 2397-3374, Vol. 9, no 5, p. 864-876Article, review/survey (Refereed) Published
Abstract [en]

In civilizations, individuals are born into or sorted into different levels of socio-economic status (SES). SES clusters in families and geographically, and is robustly associated with genetic effects. Here we first review the history of scientific research on the relationship between SES and heredity. We then discuss recent findings in genomics research in light of the hypothesis that SES is a dynamic social construct that involves genetically influenced traits that help in achieving or retaining a socio-economic position, and can affect the distribution of genes associated with such traits. Social stratification results in people with differing traits being sorted into strata with different environmental exposures, which can result in evolutionary selection pressures through differences in mortality, reproduction and non-random mating. Genomics research is revealing previously concealed genetic consequences of the way society is organized, yielding insights that should be approached with caution in pursuit of a fair and functional society.

National Category
Demography
Identifiers
urn:nbn:se:su:diva-249592 (URN)10.1038/s41562-025-02150-4 (DOI)001453392600001 ()40140606 (PubMedID)2-s2.0-105001706351 (Scopus ID)
Available from: 2025-11-13 Created: 2025-11-13 Last updated: 2025-11-13Bibliographically approved
Kolk, M., Tilley, L., von Essen, E., Moberg, Y. & Burn, I. (2025). The Demography of Sweden's Transgender Population: A Research Note on Patterns, Changes, and Sociodemographics. Demography, 62(2), 349-363
Open this publication in new window or tab >>The Demography of Sweden's Transgender Population: A Research Note on Patterns, Changes, and Sociodemographics
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2025 (English)In: Demography, ISSN 0070-3370, E-ISSN 1533-7790, Vol. 62, no 2, p. 349-363Article in journal (Refereed) Published
Abstract [en]

We examine the prevalence of gender transitions in Sweden over time and document the sociodemographic characteristics of people transitioning in different periods. Using administrative data covering the transgender population from 1973 through 2020, we analyze two common events in a gender transition: the earliest diagnosis of gender incongruence and the change of legal gender. Our research note presents three main findings. First, the measured prevalence rates of diagnoses and legal gender changes are relatively low in all periods, although they have increased substantially since the early 2010s. Second, the recent increase in transition prevalence is most pronounced among people in early adulthood; in particular, young transgender men drive an increase in overall transition rates through 2018, followed by moderate declines in 2019 and 2020. Third, transgender men and women have substantially lower socioeconomic outcomes than cisgender men and women, regardless of the age at which they transition or the historical period. They are also considerably less likely to be in a legal union or reside with children. These findings highlight the continued economic and social vulnerability of the transgender population.

Keywords
Transgender, Demography, Gender incongruence, Sweden, Administrative data
National Category
Sociology
Research subject
Gender Studies
Identifiers
urn:nbn:se:su:diva-241025 (URN)10.1215/00703370-11850105 (DOI)40084616 (PubMedID)2-s2.0-105003783439 (Scopus ID)
Available from: 2025-03-20 Created: 2025-03-20 Last updated: 2025-09-22Bibliographically approved
Campbell, T., Kolk, M. & Mosquera, J. (2025). Universal Procreation Rights and Future Generations. Journal of Applied Philosophy, 42(1), 82-95
Open this publication in new window or tab >>Universal Procreation Rights and Future Generations
2025 (English)In: Journal of Applied Philosophy, ISSN 0264-3758, E-ISSN 1468-5930, Vol. 42, no 1, p. 82-95Article in journal (Refereed) Published
Abstract [en]

It is often acknowledged that public policies can constrain people's procreative opportunities, in some cases even infringing their procreative rights. However, a topic that is not often discussed is how the procreative choices of one generation can affect the procreative opportunities of later generations. In this article, we argue that the demographic fact that childbearing above the replacement fertility level is eventually unsustainable supports two constraints on universal procreation rights: a compossibility constraint and an egalitarian constraint. We explore the implications of these two constraints and suggest that there are reasons to think of procreative opportunity as a finite resource that can be distributed more or less equally across generations. We also briefly discuss possible ways of meeting demands of intergenerational justice with respect to procreative opportunity.

National Category
Philosophy, Ethics and Religion
Identifiers
urn:nbn:se:su:diva-214576 (URN)10.1111/japp.12638 (DOI)000908836100001 ()2-s2.0-85145839742 (Scopus ID)
Available from: 2023-02-06 Created: 2023-02-06 Last updated: 2025-05-20Bibliographically approved
Barclay, K., Kolk, M. & Kravdal, O. (2024). Birth Spacing and Parents' Physical and Mental Health: An Analysis Using Individual and Sibling Fixed Effects. Demography, 61(2), 393-418
Open this publication in new window or tab >>Birth Spacing and Parents' Physical and Mental Health: An Analysis Using Individual and Sibling Fixed Effects
2024 (English)In: Demography, ISSN 0070-3370, E-ISSN 1533-7790, Vol. 61, no 2, p. 393-418Article in journal (Refereed) Published
Abstract [en]

An exten sive lit er a ture has exam ined the rela tion ship between birth spac ing and sub se quent health out comes for par ents, par tic u larly for moth ers. However, this research has drawn almost exclu sively on obser va tional research designs, and almost all stud ies have been lim ited to adjusting for observ able fac tors that could con found the rela tion ship between birth spac ing and health out comes. In this study, we use Nor we gian reg is ter data to exam ine the rela tion ship between birth spac ing and the num ber of gen eral prac ti tioner con sul ta tions for moth ers' and fathers' phys i cal and men tal health con cerns imme di ately after child birth (1-5 and 6-11 months after child birth), in the medium term (5-6 years after child bear ing), and in the long term (10-11 years after child bear ing). To exam ine short term health out comes, we esti mate indi vid ual fixed-effects mod els: we hold con stant fac tors that could influ ence par ents' birth spacing behav ior and their health, com par ing health out comes after differ ent births to the same par ent. We apply sib ling fixed effects in our anal y sis of medium- and long-term out comes, hold ing con stant moth ers' and fathers' fam ily back grounds. The results from our ana ly ses that do not apply indi vid ual or sib ling fixed effects are con sis tent with much of the pre vi ous lit er a ture: shorter and lon ger birth inter vals are asso ci ated with worse health out comes than birth inter vals of approx i ma tely 2-3 years. Estimates from indi vid ual fixed-effects mod els sug gest that par tic u larly short inter vals have a mod est neg a tive effect on mater nal men tal health in the short term, with more ambig u ous evi dence that par tic u larly short or long inter vals might mod estly influ ence short-, medium, and longterm phys i cal health out comes. Overall, these results are con sis tent with small to neg li gi ble effects of birth spac ing behav ior on (nonpreg nancyrelated) parental health outcomes.

Keywords
Birth inter vals, Physical health, Mental health, Parents, Fixed effects
National Category
Public Health, Global Health and Social Medicine
Identifiers
urn:nbn:se:su:diva-231255 (URN)10.1215/00703370-11204828 (DOI)001222183500004 ()38456775 (PubMedID)2-s2.0-85190175525 (Scopus ID)
Available from: 2024-06-20 Created: 2024-06-20 Last updated: 2025-02-20Bibliographically approved
Andersson, L. & Kolk, M. (2024). Kinship and socio-economic status: Social gradients in frequencies of kin across the life course in Sweden. Population Studies, 78(3), 371-392
Open this publication in new window or tab >>Kinship and socio-economic status: Social gradients in frequencies of kin across the life course in Sweden
2024 (English)In: Population Studies, ISSN 0032-4728, E-ISSN 1477-4747, Vol. 78, no 3, p. 371-392Article in journal (Other academic) Published
Abstract [en]

The influence of kin on various outcomes is heavily debated. However, kinship size itself conditions the probability of potential effects. Socio-economic gradients in the prevalence, variance, and types of kin are, therefore, a vital aspect of the functions of kin. Unfortunately, these parameters are largely unknown. We used Swedish register data to enumerate consanguine and in-law kin across the life course of the 1975 birth cohort. We calculated differences in kinship size between this cohort’s income quartiles and educational groups. We decomposed how specific kin relations, generations, and demographic behaviours contributed to these differences. Among low socio-economic status (SES) groups, higher fertility in earlier generations resulted in more kin compared with high-SES groups. Low-SES groups had more horizontal consanguine kin, while high-SES groups had more in-laws. Lower fertility and higher union instability among low-SES men substantially narrowed SES differences in kinship size. Kinship size varied substantially within SES groups.

National Category
Sociology (excluding Social Work, Social Psychology and Social Anthropology)
Identifiers
urn:nbn:se:su:diva-224741 (URN)10.1080/00324728.2023.2266403 (DOI)001110084700001 ()38018858 (PubMedID)2-s2.0-85177884303 (Scopus ID)
Projects
Mismatch: En ny förklaring för nedgången i samboskap i Norden
Funder
Swedish Research Council, DNR 2020-06426
Available from: 2023-12-21 Created: 2023-12-21 Last updated: 2025-02-20Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-7175-4040

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