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Table 1 The gender difference in NSSI prevalence by sample types

From: A reversed gender pattern? A meta-analysis of gender differences in the prevalence of non-suicidal self-injurious behaviour among Chinese adolescents

  Number of studies Men Women Odds Ratio 95% CI Test of heterogeneity
Events Total Events Total
College students 10 2425 7892 2304 9846 1.56 1.30,1.87*** Q(9) = 34.33, p < 0.0001
Middle school studentsa 19 8404 37,806 10,000 42,642 0.83 0.73,0.94** Q(18) = 211.71, p < 0.00001
Clinical sample 6 392 392 560 560 0.88 0.41,1.89 Q(5) = 70.48, p < 0.00001
Total 35 11,221 46,090 12,864 53,048 0.96 0.84,1.10 Q(34) = 575.84, p < 0.00001
Heterogeneity: τ 2 = 0.14, χ 2 = 575.84, df = 34 (p < 0.00001), I2 = 94%
Test of overall effect: Z = 0.59 (p = 0.56),
Test for subgroup difference: χ 2 = 31.05, df = 2 (p < 0.00001), I2 = 93.6%
  1. *p < 0.05 for total effect, **p < 0.01 for total effect, ***p < 0.001 for total effect
  2. a There are 17 studies among middle school students, but one of which provided three groups of data (Yang, Han & Shao, 2013), therefore, there are 19 groups of data were included into the analysis