Table 6. Impact of intervention on selected primary and secondary outcomes in 2007/8 according to years since last exposure to in-school intervention¹.

	Overall	Yrs since exposure to the in-school intervention
Outcome		3–4 yrs	5–6 yrs	7–8 yrs	p-value2
HIV acquisition knowledge(% with all 3 responses “correct”)	1.11 (1.01,1.23)	1.12 (1.01, 1.24)	1.12 (0.98, 1.28)	1.11 (1.01, 1.22)	0.83
STD acquisition knowledge(% with all 3 responses “correct”)	1.20 (1.04,1.39)	1.20 (1.00, 1.42)	1.23 (1.04, 1.45)	1.19 (1.01, 1.40)	0.92
Pregnancy prevention knowledge (% with all 3 responses “correct”)	1.18 (1.10,1.26)	1.17 (1.08, 1.27)	1.22 (1.12, 1.34)	1.16 (1.08, 1.25)	0.88
Reported attitudes to sex(% with all 3 responses “correct”)	1.23 (0.94,1.63)	1.14 (0.86, 1.51)	1.38 (1.02, 1.88)	1.19 (0.88, 1.61)	0.60
Age at first sex <16y	0.96 (0.85,1.09)	0.98 (0.86, 1.11)	0.98 (0.82, 1.17)	0.95 (0.84, 1.08)	0.67
>2 (female) or >4 (male) lifetime sexual partners	0.88 (0.78,0.99)	0.93 (0.76, 1.13)	0.84 (0.72, 0.98)	0.90 (0.82, 0.99)	0.72
>1 partner in last 12 months	0.93 (0.82,1.07)	0.99 (0.78, 1.24)	0.92 (0.79, 1.07)	0.91 (0.80, 1.04)	0.39
Used condom at last sex in past 12m 3	1.22 (0.97,1.53)	1.08 (0.89, 1.31)	1.34 (0.97, 1.84)	1.28 (0.96, 1.70)	0.15
HSV-2 prevalence	0.96 (0.85,1.09)	0.99 (0.83, 1.17)	0.98 (0.83, 1.15)	0.94 (0.86, 1.03)	0.33

1 Overall prevalence ratio adjusted for gender, age group, stratum and ethnic group (Sukuma vs non-Sukuma). Prevalence ratio according to years since exposure to the intervention adjusted for gender, age group, stratum and ethnic group (Sukuma vs non-Sukuma) and total years of exposure to the in-school component of the intervention (99-04).

2. From test for interaction.

3. Among those who reported having had sex in past 12m.