Extended Data Table 5 The between-group comparisons for primary outcomes among trainer teachers (n = 223)

From: School-based suicide prevention using the gatekeeper programme: a cluster-randomized trial

  1. Statistical analysis was performed using independent samples t-tests, with two-sided p-values reported. Cohen’s d values and 95% confidence intervals (CI) are provided for effect size. P-values were adjusted using the false discovery rate (FDR) correction to account for potential false positives
  2. Compared to the waitlist control, the intervention group had significant improvement on stigma against suicide immediately post-intervention (Cohen’s d = -1.55, PFDR = 1.8×10−22), and this effect was maintained at 6 months (Cohen’s d = -0.74, PFDR = 2.0×10−7) and 12 months post-intervention (Cohen’s d = -0.78, PFDR = 7.4×10−8) among trainer teachers. Similarly, the intervention group had significantly improvement on suicide literacy compared to control condition at immediately post-intervention (Cohen’s d = 1.08, PFDR = 1.4×10−13) and this effect was maintained at 6 months (Cohen’s d = 0.90, PFDR = 6.4×10−10) and at 12 months (Cohen’s d = 0.70, PFDR = 1.0×10−6). Additionally, perceived competence was significantly improved in the intervention group compared to those in the control group at immediately post-intervention (Cohen’s d = 1.98, PFDR = 4.4×10−33), 6 months follow-up (Cohen’s d = 1.13, PFDR = 2.8×10−14), and 12 months follow up (Cohen’s d = 0.82, PFDR = 3.9×10−8). Similarly, compared to the waitlist control, participants in the intervention condition had significantly improved willingness to intervene at immediately post-intervention (Cohen’s d = 1.34, PFDR = 8.9×10−19), 6 months follow-up (Cohen’s d = 1.29, PFDR = 4.4×10−17), and 12 months follow-up (Cohen’s d = 0.47, PFDR = 6.7×10−4).
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