Table 5

Intervention effects on student primary and secondary outcomes at the final follow-up before and after adjusting for potential mediators at the interim follow-up

Continuous student outcomes Arm Unadjusted effect Adjusted effect
(baseline covariates) 		Adjusted effect
(baseline covariates plus student view of school climate) 		Adjusted effect
(baseline covariates plus friends’ contact with police in last year) 		Adjusted effect
(baseline covariates plus staff view of school organisational climate)
Control
Mean (SE) 		Intervention
Mean (SE) 		Difference (95% CI) P value Difference (95% CI) P value Difference
(95% CI) 		P value Difference
(95% CI) 		P value Difference
(95% CI) 		P value
Bullying victimisation (GBS overall score)0.34 (0.02)0.29 (0.02)−0.03
(−0.06 to −0.00)		0.039−0.03
(−0.06 to −0.00)		0.044−0.04
(−0.08 to −0.01)		0.007−0.04
(−0.07 to −0.01)		0.016−0.02
(−0.07 to 0.03)		0.380
Aggression perpetration (ESYTC overall score)4.33 (0.20)4.04 (0.21)−0.07
(−0.38 to 0.25)		0.684−0.13
(−0.43 to 0.18)		0.421−0.20
(−0.52 to 0.13)		0.229−0.12
(−0.44 to 0.20)		0.4690.03
(−0.58 to 0.64)		0.917
Quality of life (PedsQL overall score)78.82 (0.54)80.65 (0.55)1.16
(0.41 to 1.90)		0.0021.44
(0.70 to 2.17)		<0.0011.42
(0.64 to 2.21)		<0.0011.26
(0.49 to 2.03)		0.0011.43
(0.09 to 2.77)		0.036
Psychological functioning (SDQ total difficulties score12.20 (0.18)11.51 (0.19)−0.51
(−0.80 to −0.22)		<0.001−0.54
(−0.83 to −0.25)		<0.001−0.62
(−0.92 to −0.31)		<0.001−0.54
(−0.85 to −0.24)		<0.001−0.38
(−0.92 to 0.17)		0.170
SWEMWBS total well-being index)22.88 (0.19)23.32 (0.19)0.27
(−0.06 to 0.60)		0.1150.33
(0.00 to 0.66)		0.0480.27
(−0.08 to 0.62)		0.1410.23
(−0.13 to 0.58)		0.2100.21
(−0.36 to 0.80)		0.463
Health utility (CHU9D overall score)0.85 (0.00)0.86 (0.01)0.01
(−0.00 to 0.01)		0.2440.01
(−0.00 to 0.01)		0.0800.00
(−0.00 to 0.01)		0.1530.00
(−0.00 to 0.01)		0.2170.00
(−0.01 to 0.01)		0.570
Age of sexual debut13.11 (0.43)12.54 (0.49)−0.58
(−1.97 to 0.81)		0.416−0.35
(−1.48 to 0.78)		0.541−0.24
(−1.48 to 1.00)		0.703−0.40
(−1.65 to 0.84)		0.525−0.51
(−2.03 to 1.01)		0.513
Bullying perpetration (MAS bullying subscale score)2.75 (0.21)2.33 (0.21)−0.28
(−0.84 to 0.29)		0.334−0.26
(−0.57 to 0.05)		0.097−0.29
(−0.57 to −0.00)		0.047−0.16
(−0.45 to 0.13)		0.279−0.27
(−0.69 to 0.14)		0.193