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Table 2 Rate ratios (95% CI) for reduction in suicidal behaviours between study periods in the intervention and control groups, with intervention effect ratio (reduction in intervention period in intervention arm relative to control arm)

From: Preventing suicidal behaviours with a multilevel intervention: a cluster randomised controlled trial

  Rate ratio (95% CIa) Intervention effect ratiob
  (intervention period relative to baseline) (95% CIa)
Outcome variable Intervention Control  
ISH presentations and self-inflicted death events 0.91 (0.81–1.02) 0.85 (0.76–0.95) 1.07 (0.82–1.40)
ISH presentations only 0.91 (0.80–1.02) 0.85 (0.75–0.95) 1.07 (0.82–1.40)
Self-inflicted death events only 1.17 (0.84–1.65) 1.01 (0.77–1.31) 1.18 (0.51–2.70)
  1. a95% confidence interval for estimate
  2. bIntervention effect ratio is the between-period change in the intervention arm divided by the between-period change in the control arm. A ratio less than one indicates more favourable change in the intervention arm than the control arm; a ratio greater than one indicates more favourable change in the control arm than in the intervention arm