A new GLO Discussion Paper finds that peer depression in adolescence affects own depression in adulthood, but family can function as a buffer.
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GLO Discussion Paper No. 531, 2020
Peers, Gender, and Long-Term Depression– Download PDF
by Giulietti, Corrado & Vlassopoulos, Michael & Zenou, Yves
GLO Fellows Corrado Giulietti & Yves Zenou
Corrado Giulietti 
Yves Zenou
Author Abstract: We provide first evidence that peer depression in adolescence affects own depression in adulthood. We use data from Add Health and an identification strategy that relies on within-school and across-cohort idiosyncratic variation in the share of own-gender peers who are depressed. We find a significant peer effect for females but not for males. An increase of one standard deviation of the share of own-gender peers (schoolmates) who are depressed increases the probability of depression in adulthood by 2.6 percentage points for females (or 11.5% of mean depression). We also find that the peer effect is already present in the short term when girls are still in school and provide evidence for why it persists over time. Further analysis reveals that individuals from families with a lower socioeconomic background are more susceptible to peer influence, thereby suggesting that family can function as a buffer. Our findings underscore the importance of peer relationships in adolescence with regard to the development of long-lasting depression in women.
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