TY  - JOUR
A1  - Fishman, Samuel
T1  - An extended evaluation of the weathering hypothesis for birthweight
Y1  - 2020/09/16
JF  - Demographic Research
JO  - Demographic Research
SN  - 1435-9871
SP  - 929
EP  - 968
DO  - 10.4054/DemRes.2020.43.31
VL  - 43
IS  - 31
UR  - https://www.demographic-research.org/volumes/vol43/31/
L1  - https://www.demographic-research.org/volumes/vol43/31/43-31.pdf
L2  - https://www.demographic-research.org/volumes/vol43/31/43-31.pdf
N2  - Background: Prior weathering research finds that US-born Black women experience more rapidly deteriorating birthweight outcomes at older ages than US-born White women. 

Objective: The present study extends this literature by evaluating maternal age–birthweight associations across a variety of racial/ethnic-nativity groups. 

Methods: Race/ethnicity-nativity stratified average marginal effects of maternal age on low and very low birthweight are estimated using data from 2014 through 2018 US cohort natality files. 

Results: Older maternal ages at birth are associated with higher probabilities of low and very low birthweight for most racial/ethnic-nativity groups. Consistent with the weathering hypothesis, birth at older maternal ages (e.g., 30‒34 or 40+) is more predictive of low and very low birthweight for US-born Black, American Indian/Alaskan Native, and US-born Mexican American women than for US-born Whites. In contrast, some foreign-born populations exhibit relatively weak relationships between maternal age and low birthweight, suggesting the role of healthy immigrant selection. 

Contribution: Some disadvantaged racial/ethnic-nativity groups ‒ US-born Black, American Indian/Alaskan Native, and US-born Mexican American women ‒ exhibit more rapid increases in the risk of low birthweight at older maternal ages than US-born White women. These patterns are consistent with the weathering hypothesis. Future research may benefit from using linked family data and sibling modeling approaches to estimate causal models of weathering. 

ER  -