# Table 3 Logistic regression investigating the association of sexual risk behaviours for Phase 1 and Phase 2

Relationship Status in the last 12 monthsa Age of last sexual partnerb Used a condom the last sex actc Report of any STIs in the past 6 monthsd
No partner or one steady/casual partner at any given time > One partner at some given time (1) About same or >  5 years older > 5 years younger (1) Yes No (1) Had an STI in the past 6 months No STI in the past 6 months (1)
Phase 1 (23 Jun −30 Sep 2014) N = 1597 1136 (71.1) 459 (28.7) 1159 (72.6) 393 (24.6) 789 (49.4) 763 (47.8) 1531 (95.9) 45 (2.8)
Phase 2 (22 Jun −30 Sep 2015) N = 1216 781 (64.2) 433 (35.6) 824 (67.8) 331 (27.2) 550 (45.2) 606 (49.8) 1092 (89.8) 35 (2.9)
Unadjusted OR (95% CI) Phase 2 to Phase 1, p-value 1.37 (1.17;1.61), p < 0.001 1.18 (1.00;1.41), p = 0.05 1.14 (0.98;1.33), p = 0.09 1.09 (0.70;1.71), p = 0.71
Adjusted for agee OR (95% CI) Phase 2 to Phase 1, p-value 1.39 (1.18;1.63), p < 0.001 1.02 (0.85;1.24), p = 0.81 1.06 (0.91;1.25), p = 0.42 1.09 (0.69;1.71), p = 0.71
1. atwo missing relationship status in each phase
2. b42 not sexually active in the past 12 months in Phase 1, 56 not sexually active in the past 12 and 5 missing in Phase 2
3. c42 not sexually active in the past 12 months, 2 did not know partner’s age and 1 missing in Phase 1. 56 not sexually active in the past 12 months in Phase 2, 2 did not know, I, 4 missing in Phase 2
4. d110 excluded in the analysis because of missing data (21 Phase 1, 89 Phase 2)
5. eAdjusted for age in four categories; 18–20 years, 21–24 years, 25–30 years, 31–49 years