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Table 2 The gender difference in NSSI prevalence by areas

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
Rurala 5 3247 13,934 3339 13,277 0.91 0.86,0.96*** Q(4) = 1.01, p = 0.91
Urbana 8 3669 13,990 3605 14,668 1.01 0.84,1.22 Q(7) = 56.32, p < 0.00001
Hongkonga 5 1066 8041 2386 12,581 0.58 0.47,0.72*** Q(4) = 21.49, p < 0.0003
Total 18 7982 35,965 9330 40,526 0.84 0.74,0.96* Q(17) = 189.86, p < 0.00001
Heterogeneity: τ 2 = 0.06, χ 2 = 189.86, df = 17 (p < 0.00001), I2 = 91%
Test of overall effect: Z = 2.58 (p = 0.010)
Test for subgroup difference: 0.06, χ 2 = 17.35, df = 2 (p = 0.0002), I2 = 88.5%
  1. *p < 0.05 for total effect, **p < 0.01 for total effect, ***p < 0.001 for total effect
  2. a There are one from 19 groups of data among middle school students was excluded because this data included middle schools in both rural and urban areas, but did not provide the separated data