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. 2023 Mar 20;54(2):374–379. [Article in Chinese] doi: 10.12182/20230160106

表 1. Incidence of NSSI among male and female middle school students of different grades (n=3382).

不同性别和年级的初中生NSSI发生率(n=3382)

Demographic characteristic n NSSI/case (%) χ 2 P
Gender 35.436 <0.001
 Male 1678 747 (44.52)
 Female 1704 933 (54.75)
Grade 620.472 <0.001
 Seventh grade 1157 374 (32.32)
 Eighth grade 1142 432 (33.82)
 Ninth grade 1083 874 (80.70)