Home > Publications . Search All . Browse All . Country . Browse PSC Pubs . PSC Report Series

PSC In The News

RSS Feed icon

Stephenson says homophobia among gay men raises risk of intimate partner violence

Frey says having more immigrants with higher birth rates fills need in the US

Inglehart's work on the rise of populism cited in NYT

More News

Highlights

Savolainen wins Outstanding Contribution Award for study of how employment affects recidivism among past criminal offenders

Giving Blueday at ISR focuses on investing in the next generation of social scientists

Pfeffer and Schoeni cover the economic and social dimensions of wealth inequality in this special issue

PRB Policy Communication Training Program for PhD students in demography, reproductive health, population health

More Highlights

Next Brown Bag

Mon, Jan 23, 2017 at noon:
H. Luke Shaefer

David Lam photo

Global Patterns of Seasonal Variation in Human Fertility

Publication Abstract

Lam, David, and Jeffrey A. Miron. 1994. "Global Patterns of Seasonal Variation in Human Fertility." Annals of the New York Academy of Sciences, 709: 9-28.

This paper looks at seasonal patterns in births in populations around the world with a focus on two major issues. First, the authors examine the extent of systematic similarities and differences in seasonal patterns across populations, paying particular attention to the well-defined but quite different patterns in the southern United States and northern Europe. They also examine the extent to which seasonal birth patterns in the southern hemisphere are a mirror image of patterns in the northern hemisphe re. The second major issue addressed is the extent to which temperature explains seasonal birth patterns and the differences in these patterns across countries.

The authors find that the most pronounced seasonal patterns are in the southern United States, where births decline substantially in April and May, and in northern Europe, where births increase substantially in March and April. Although seasonal variatio ns in fertility were more pronounced in earlier agricultural populations, the authors show that seasonality has increased in this century in some high income, low fertility populations such as Sweden. They use data on monthly temperature to analyze the potential role of temperature in explaining the July-August trough in conceptions in the southern United States. They find little evidence, however, that temperature plays any role in explaining the pronounced June-July peak in conceptions in Sweden. Temperature also appears to be relatively unimportant in several other populations with substantial seasonal variations in births, suggsting that other factors play an important role in birth seasonality.

Browse | Search : All Pubs | Next