Teens from larger families have poorer mental health than those with fewer siblings, according to a large analysis of children in the United States and China.
The details of the pattern vary depending on factors such as the spacing of sibling ages and the age of the siblings.
But the fact that the overall pattern was found in both countries is striking, said Doug Downey, lead author of the study and professor of sociology at The Ohio State University.
Downey conducted the study with Rui Cao, a doctoral student in sociology at Ohio State. Their results were published recently in the Journal of Family Issues.
Their Chinese analysis draws on more than 9,400 eighth graders from the China Education Panel Study. In the United States, they analyzed over 9,100 American eighth graders from the Early Childhood Longitudinal Study – Kindergarten Cohort of 1988.
The average youth in China has nearly .7 fewer siblings than the average American youth (.89 compared to 1.6).