Table 3. Odds ratios of explanatory variables to predict transition into first sex by Wave 2, by age group.

Variables in the equation	Female	Male
	OR (95% Confidence Interval)	OR (95% Confidence Interval)
12-15 years
Slum residence (ref. non slum)	2.0 (0.7 - 5.3)	10.0** (1.5 - 65.2)
Currently in school (ref. not in school)	0.5 (0.1 - 3.2)	0.5 (0.0 - 4.4)
Number of adolescents in HH (ref. one)
Two	1.4 (0.6 - 3.4)	1.9 (0.5 - 7.5)
Three or more	1.0 (0.4 - 2.4)	2.1 (0.6 - 7.2)
Peer models for conventional behavior a	0.8 (0.6 - 1.1)	0.8 (0.6 - 1.1)
Perceived parental monitoring b	1.1* (1.0 - 1.2)	1.0 (0.9 - 1.1)
Peer models for unconventional behavior c	0.9 (0.7 - 1.1)	0.8 (0.5 - 1.2)
Non-penetrative sexual contact (ref. never)	0.6 (0.1 - 2.8)	3.1 (0.6 - 17.6)
Delinquent behavior d	1.4** (1.1 - 1.8)	1.0 (0.7 - 1.4)
Substance use (ref. never use)	3.3 (0.6 - 17.2)	1.3 (0.3 - 6.3)
Observations	357	336
Wald χ2 (10)	19.08	21.19
Pseudo R2	0.0665	0.1077
16-19 years
Slum residence (ref. non slum)	1.0 (0.3 - 3.2)	0.3** (0.1 - 1.0)
Currently in school (ref. not in school)	0.5 (0.1 - 1.8)	1.6 (0.1 - 26.5)
Number of adolescents in HH (ref. one)
Two	1.8 (0.5 - 7.1)	1.1 (0.2 - 8.4)
Three or more	1.0 (0.3 - 3.4)	1.7 (0.3 - 12.0)
Peer models for conventional behavior a	0.8 (0.5 - 1.1)	0.8 (0.6 - 1.1)
Perceived parental monitoring b	1.1 (0.9 - 1.2)	1.0 (0.9 - 1.1)
Peer models for unconventional behavior c	1.8** (1.1 - 2.8)	1.2 (0.8 - 1.6)
Non-penetrative sexual contact (ref. never)	0.3 (0.1 - 1.3)	1.0 (0.3 - 3.3)
Delinquent behavior d	1.2 (0.8 - 1.9)	1.3 (0.9 - 1.9)
Substance use (ref. never use)	0.4 (0.0 - 5.0)	0.5 (0.1 - 2.2)
Observations	93	94
Wald χ2 (10)	12.54	16.04
Pseudo R2	0.1162	0.1251

^aIncreasing values indicate higher levels of peer models for conventional behavior;

^bIncreasing values indicate higher levels of parental monitoring;

^cIncreasing values indicate higher levels of peer models for unconventional behavior;

^dIncreasing values indicate higher levels of delinquent behavior

Note: 95% confidence intervals in parentheses;

^***p<0.01,

^**p<0.05,

^*p<0.1