Martin Kolk

Martin Kolk

Researcher, Docent

Visa sidan på svenska
Works at Department of Sociology
Visiting address Universitetsvägen 10 B, plan 9
Room B 879
Postal address Sociologiska institutionen, Demografiska avdelningen 106 91 Stockholm

About me

I am a researcher and Docent (Associate Professor) at SUDA (Stockholm University Demography Unit), CEK (Centre for Cultural Evolution), and IF (Institute for Future Studies), working on various aspects of intergenerational demography, economic demography, same-sex childbearing, and cultural evolution. Many of my research interests are about the demography of kinship and economic demography in contemporary and historical populations. Currently, I use linked register and parish data with micro-level data to examine demographic change from the mid 18th century until today. I am also working with researchers at the program for historical demography at Academica Sinicia in Taipei, Taiwan.

My research interests are often related to intergenerational demographic processes, but I have written papers on many areas of demography, including fertility, mortality, migration, same-sex demography, household composition, and union formation. I am also interested in cultural evolution, and in particular relationship between cultural evolution and demographic parameters.

Recent studies include; kinship and stratification, long-term consequences of intergenerational transmission of fertility, age differences in unions, cohort approaches to migration, and influences of family composition in childhood on various demographic outcomes. 

My Google Scholar page is available here and my CV can be found to the right.

Most of my publications are available for everyone to download using this link.


Recent Publications:

Barclay, Kieron and Martin Kolk (2020) “The Influence of Health in Early Adulthood on Male Fertility” Population and Development review, accepted for publication

Barclay, Kieron, Anna Baranowska-Rataj, Martin Kolk, and Anneli Ivarsson (2020) “Interpregnancy Intervals and Perinatal and Child Health in Sweden: A Comparison Within Families and Across Social Groups” Population Studies, Available online

Kolk, Martin and Gunnar Andersson (2020) “Two Decades of Same-sex Marriage in Sweden. A Demographic Account of Developments in Marriage, Childbearing and Divorce” Demography, 57(1): 147-169

Morosow, Kathrin and Martin Kolk (2020) “How does Birth Order and Number of Siblings Effect Fertility? A Within-Family Comparison using Swedish Register Data” European Journal of Population, 36: 197-233

Bernard, Aude and Martin Kolk (2019) “Why are young Swedes moving more? A cohort analysis of internal migration by move order” European Journal of Population, Available online

Li, Chun-Hao, Martin Kolk, Wen-Shan Yang, and Ying-Chang Chuang (2019) “Uxorilocal Marriage as a Strategy for Heirship in a Patrilineal Society: Evidence from Household Registers in Early 20th-Century Taiwan”, History of the Family, 25(1): 22-45

Kolk, Martin (2019) “Period and Cohort Measures of Internal Migration” Population, 74(3): 333-348

Molitoris, Joseph, Kieron Barclay, and Martin Kolk (2019) “When Birth Spacing Does and Does Not Matter for Child Survival: An International Comparison using the DHS” Demography, 56(4): 1349-1370

Kolk, Martin and Kieron Barclay (2019) “Cognitive ability and fertility amongst Swedish men born 1951-1967. Evidence from military conscription registers” Proceedings of the Royal Society B, 286 (1902): 20190359

Barclay, Kieron and Martin Kolk (2019) “Parity and Mortality: An Examination of Different Explanatory Mechanisms Using Data on Biological and Adoptive Parents” European Journal of Population, 35(1): 63-85

Kolk, Martin (2019) “Weak support for a U-shaped pattern between societal gender equality and fertility when comparing societies across time” Demographic Research, 40: 27-48

Kridahl, Linda and Martin Kolk (2018) “Retirement coordination in opposite-sex and same-sex married couples: Evidence from Swedish registers” Advances in Life Course Research, 38: 22-36

Dahlberg, Johan and Martin Kolk (2018) “Explaining Swedish Sibling Similarity in Fertility – Parental Fertility Behavior vs. Social Background” Demographic Research, 39: 884-893

Barclay, Kieron and Martin Kolk (2018) “Birth Intervals and Health in Adulthood: A Comparison of Siblings using Swedish Register Data” Demography, 55(3): 929–955

Kolk, Martin and Martin Hällsten (2017) “Demographic and educational success of lineages in northern Sweden” Population and Development Review, 43(3): 491–51

Barclay, Kieron and Martin Kolk (2017) “The long-term cognitive and socioeconomic consequences of birth intervals: a within-family sibling comparison using Swedish register data” Demography, 54(2): 459-484

Kolk, Martin (2017) “A life course analysis of geographical distance to siblings, parents and grandparents in Sweden” Population, Space and Place, 23(3): e2020

Baranowska-Rataj, Anna, Kieron Barclay and Martin Kolk (2017) ”The effect of the number of siblings on adult mortality: Evidence from Swedish registers” Population Studies, 68(1): 111-129

Chudnovskaya, Margarita, & Martin Kolk (2017) “Educational expansion and intergenerational proximity in Sweden” Population, Space and Place, 23(1): e1973

Barclay, Kieron, Katherine Keenan, Emily Grundy, Martin Kolk and Mikko Myrskylä (2016). “Reproductive history and post-reproductive mortality: A sibling comparison analysis using Swedish register data” Social Science & Medicine, 155: 82-92

Kolk, Martin and Sebastian Schnettler (2016) “Socioeconomic status and sex ratios at birth in Sweden. No evidence for a Trivers-Willard effect for a wide range of status indicators” American Journal of Human Biology28(1): 67-73

Andersson, Gunnar and Martin Kolk (2015) ”Trends in childbearing, marriage and divorce in Sweden: An update with data up to 2012” Finnish Yearbook of Population Research, 50: 21-30

Kolk, Martin (2015) “Age differences in unions: Continuity and divergence in Sweden between 1932 and 2007” European Journal of Population, 31(4): 365-382

Kolk, Martin (2015) “The causal effect of an additional sibling on completed fertility – An estimation of intergenerational fertility correlations by looking at siblings of twins” Demographic Research,  32: 1409-1420

Barclay, Kieron and Martin Kolk (2015) “Birth order and mortality: A population based cohort study” Demography, 52(2): 613-639

Kolk, Martin, Daniel Cownden and Magnus Enquist (2014) “Correlations in fertility across generations – can low fertility persist” Proceedings of the Royal Society B, 281(1779): 20132561

Kolk, Martin (2014) “Understanding transmission of fertility across multiple generations – Socialization or socioeconomics?” Research in Social Stratification and Mobility, 35: 89-103

Kolk, Martin (2014) “Multigenerational transmission of family size in contemporary Sweden” Population Studies, 68(1): 111-129



Recent Working papers

Brandén, Maria, Siddartha Aradhya, Martin Kolk, Juho Härkönen, Sven Drefahl, Bo Malmberg, Mikael Rostila, Agneta Cederström, Gunnar Andersson, Eleonora Mussino (2020): Residential Context and COVID-19 Mortality among the Elderly in Stockholm: A population-based, observational study. Stockholm Research Reports in Demography. Stockholm Research Reports in Demography. 2020:31

Saarela, Jan and Martin Kolk (2020) “Alcohol-related mortality by ethnic origin: Findings based on multigenerational population register data from Finland and Sweden” Stockholm Research Reports in Demography. 2020:27

Drefahl, Sven, Matthew Wallace, Eleonora Mussino, Siddartha Aradhya, Martin Kolk, Maria Brandén, Bo Malmberg,and Gunnar Andersson (2020) “Socio-demographic risk factors of COVID-19 deaths in Sweden: A nationwide register study”  Stockholm Research Reports in Demography. 2020:23

Gardner, Eugene J., Matthew D. C. Neville, Kaitlin E. Samocha, Kieron Barclay, Martin Kolk, Mari E. K. Niemi, George Kirov, Hilary C. Martin, and Matthew E. Hurles (2020) “Sex-biased reduction in reproductive success drives selective constraint on human genes” bioRxiv.

Saarela, Jan, Martin Kolk, and Ognjen Obućina. Kinship (2020) “Heritage and Ethnic Choice: Ethnolinguistic Registration across Four Generations in Contemporary Finland”  Stockholm Research Reports in Demography. 2020:16

Kolk, Martin and Kieron Barclay (2020) “Do income and marriage mediate the relationship between cognitive ability and fertility? Data from Swedish taxation and conscriptions registers for men born 1951-1967” Stockholm Research Reports in Demography. 2020:11

Hällsten, Martin, and Martin Kolk (2020, January 29) “The shadow of peasant past: Seven generations of inequality persistence in Northern Sweden” SocArXiv.

Barclay, Kieron and Martin Kolk (2019) “The Influence of Health in Early Adulthood on Male Fertility” Stockholm Research Reports in Demography. 2019:26

Kolk, Martin and Vegard Skirbekk (2019) “Fading Family Lines - Women and men without children, grandchildren and great-grandchildren in 19th, 20th, and 21st century Northern Sweden” Stockholm Research Reports in Demography. 2019:24

Kolk, Martin (2019) “The relationship between lifecourse accumulated income and childbearing of Swedish men and women” Stockholm Research Reports in Demography. 2019:19

Kolk, Martin (2019) “Demographic theory and population ethics - relationships between population size and population growth” Studies on climate ethics and future generations - working paper series. 2019:11

Chiara, Ludovica Comolli, Gerda Neyer, Gunnar Andersson, Lars Dommermuth, Peter Fallesen, Marika Jalovaara, Ari Jónsson, Martin Kolk and Trude Lappegård. ”Beyond the Economic Gaze: Childbearing during and after recessions in the Nordic countries” Stockholm Research Reports in Demography. 2019:16

Grätz, Michael and Martin Kolk (2019) “Sibling Similarity in Income: A Life Course Perspective” Stockholm Research Reports in Demography. 2019:14


Doctoral thesis:

Kolk, Martin (2014) Multigenerational processes in demography. Stockholm University: Stockholm.


Last updated: July 8, 2020

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