Impact evaluation of a community-based intervention to reduce risky sexual behaviour among female sex workers in Shanghai, China

Table 5 STI prevalence and 95% CI ^a among 556 FSWs ^b at baseline and six months after intervention, Shanghai, 2009-10

	Intervention			Control			Intervention vs. Control		AOR (95% CI)^c	p-value
	Intervention			Control			p-value
	Baseline, % (n = 278)	Follow-up, % (n = 150)	p-value	Baseline, % (n = 278)	Follow-up, % (n = 200)	p-value	Baseline	Follow-up
Chlamydia	15.8 (9.7-19.3)	11.4 (6.8-17.6)	0.272	12.2 (8.6-16.7)	9.5 (5.8-14.4)	0.4294	0.2712	0.6875	1.16 (0.57-2.33)	0.6886
Gonorrhoea	5.8 (3.3-9.2)	2.7 (0.74-6.7)	0.2335	0.72 (0.09-2.6)	3.0 (1.1-6.4)	0.0731	0.0018	1.000	0.96 (0.30-3.09)	0.9484
Syphilis	1.1 (0.2-3.1)	0.67 (0.0-3.7)	0.9177	1.4 (0.39-3.6)	2.0 (0.55-5.0)	0.725	1.000	0.3969	0.39 (0.06-2.73)	0.3433
Any STI	19.8 (15.3-25.0)	14.1 (8.9-20.7)	0.1828	14.0 (10.2-18.7)	14.5 (9.9-20.2)	0.9898	0.0897	0.9645	0.94 (0.51-1.74)	0.8398

^a95% exact binomial confidence interval.
^bRandomly selected 57 participants who were lost to follow-up in the intervention arm were added to equalize the sample sizes in the two arms.
^cAdjusted odds ratio, invention group vs control group at follow-up after adjusting for baseline level and venue type, among those had a follow-up.

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