Table 2.

Hierarchical linear regression model results, predictors of age of sexual initiation among boys.

	Model 1	Model 2	Model 3	Model 4	Model 5	Model 6	Model 7
	β	β	β	β	β	β	β
Step 1: Control
Social class	0.158 **	0.101	0.086	0.083	0.079	0.078	0.071
Step 2: Peers
Peer support		0.138 *	0.071	0.071	0.066	0.060	0.060
Number of close male friends		0.198 **	0.176 **	0.175 **	0.18 **	0.175 **	0.165 *
Step 3: Family
Family support			0.165 **	0.144 *	0.136 *	0.135 *	0.135
Step 4: Risk behaviours
Risk behaviours initiation				−0.153 **	−0.136 *	−0.129 *	−0.129 *
Step 5: School
Relationship with teachers and school					−0.065	−0.048	−0.043
Step 6: Life perception
Happiness and satisfaction with life						0.050	0.033
Step 7: Environment
Positive neighbourhood environment							−0.052
R2	0.022	0.065	0.083	0.103	0.106	0.107	0.109
∆R2	0.022	0.044	0.018	0.020	0.003	0.002	0.002
Adjusted R2	0.019	0.059	0.074	0.092	0.093	0.093	0.093
F	9.52 **	10.05 ***	9.74 ***	9.84 ***	8.46 ***	7.35 ***	6.53 ***

* p ≤ 0.05; ** p ≤ 0.01; *** p ≤ 0.001.