First birth interval, an indicator of energetic status, is a predictor of lifetime reproductive strategy. Issue 1 (7th November 2012)

• Record Type: Journal Article
• Authors: Nenko, Ilona; Jasienska, Grazyna
• Is Part Of: American journal of human biology. Volume 25:Issue 1(2013:Jan./Feb.)
• Page Start: 78
• Page End: 82
• Publication Date: 2012-11-07
• Subjects: Human biology -- Periodicals; Physical anthropology -- Periodicals; Biologie humaine -- Périodiques; Anthropologie physique -- Périodiques; 612
• DOI: 10.1002/ajhb.22344
• Languages: English
• ISSNs: 1042-0533

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <sec id="abs1-1" sec-type="section"> <title>Objectives:</title> <p>Women should differ in their reproductive strategies according to their nutritional status. We tested a hypothesis that women who have a good nutritional status early in life, as indicated by a shorter waiting time to the first birth (first birth interval, FBI), are able to afford higher costs of reproduction than women who have worse nutritional condition.</p> </sec> <sec id="abs1-2" sec-type="section"> <title>Methods:</title> <p>We collected data on 377 women who got married between the years 1782 and 1882 in a natural fertility population in rural Poland. The study group was divided into tertiles based on the length of FBI.</p> </sec> <sec id="abs1-3" sec-type="section"> <title>Results:</title> <p>Women with the shortest FBI had a higher number of children (<italic>P</italic> = 0.005), higher number of sons (<italic>P</italic> = 0.01), and shorter mean interbirth intervals (<italic>P</italic> = 0.06). Women who had ever given birth to twins had shorter FBI than women of singletons (20.1 and 26.1 months, respectively; <italic>P</italic> = 0.049). Furthermore, women with a shorter FBI, despite having higher costs of reproduction, did not have a different lifespan than women with a longer FBI.</p> </sec> <sec id="abs1-4" sec-type="section"> <title>Conclusions:</title> <p>Our results suggest that women who were in better energetic condition (shorter length of FBI), achieved higher reproductive success without reduction in lifespan. FBI reflects interindividual variation, which may result from variation in nutritional status early in life and thus may be a good predictor of subsequent reproductive strategy. We propose to use FBI as an indicator of women's nutritional status in studies of historical populations, especially when information about social status is not available. Am. J. Hum. Biol., 2013. © 2012 Wiley Periodicals, Inc.</p> </sec> </abstract>