This paper uses Danish register data to examine the effect of relative age for grade on women’s risky health behavior. I exploit an administrative rule that creates a discontinuous jump in relative age for grade for children born around January 1. Being young-for-grade leads to a higher probability of an abortion and alcohol poisoning in adolescence and earlier births, cohabitation and contraceptive use. The results show how relative age for grade is a determinant of adolescent women’s risky sex and heavy drinking. For men, being young-for-grade have no effect on alcohol poisonings, fatherhood and cohabitation.

中文翻译：

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年级和青少年危险健康行为的相对年龄

本文使用丹麦注册数据来检验不同年级的相对年龄对女性危险健康行为的影响。我利用了一项行政规则，该规则会导致 1 月 1 日左右出生的儿童的年级相对年龄不连续跳跃。年级年轻导致青春期和早产、同居和使用避孕药具时堕胎和酒精中毒的可能性更高。结果表明，年级的相对年龄是青春期女性冒险性行为和酗酒的决定因素。对于男性来说，年轻化对酒精中毒、父亲身份和同居没有影响。