剖宫产的长期效应

This paper analyzes the long-term effects of potentially avoidable cesarean sections on children's health.Using Finnish administrative data, we document that physicians perform more unplanned C-sections during their regular working hours on days that precede a weekend or public holiday and use this exogenous variation as an instrument for C-sections.We supplement our instrumental variables results with a differencesin-differences estimation strategy that exploits variation in birth mode within sibling pairs and across families.Our results suggest that avoidable unplanned C-sections increase the risk of asthma, but do not affect other immune-mediated disorders previously associated with C-sections.