期刊
DEVELOPMENTAL PSYCHOLOGY
卷 42, 期 3, 页码 533-542出版社
AMER PSYCHOLOGICAL ASSOC
DOI: 10.1037/0012-1649.42.3.533
关键词
menarche; pubertal timing; family stress; children of twins; stepfathering
资金
- NIAAA NIH HHS [AA000264, R01 AA007535] Funding Source: Medline
- NICHD NIH HHS [R01 HD056354-01, R01 HD056354] Funding Source: Medline
Girls who grow up in households with an unrelated adult male reach menarche earlier than peers, a finding hypothesized to be an evolutionary strategy for families under stress. The authors tested the alternative hypothesis that nonrandom selection into stepfathering due to shared environmental and/or genetic predispositions creates a spurious relation between stepfathering and early menarche. Using the unique controls for genetic and shared environmental experiences offered by the children-of-twins design, the authors found that cousins discordant for stepfathering did not differ in age of menarche. Moreover, controlling for mother's age of menarche eliminated differences in menarcheal age associated with stepfathering in unrelated girls. These findings strongly suggest selection, and not causation, accounts for the relationship between stepfathering and early menarche.
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