7. Enhanced patient referral versus simple patient referral, number of partners treated per index patient randomised, effect size.

Comparison	N (studies)	n (participants)	Study ID	MD (95% CI)	Test for heterogeneity I2; Chi2, P value
Home sampling kit vs. simple patient referral	1	200	Apoola 2009	‐0.03 (‐0.25 to 0.19)	n/a
Additional counselling vs. simple patient referral	1	863	Ellison undated	0.04 (‐0.02 to 0.1)	n/a
Patient referral (DIS) vs. patient referral (nurse)	2	597	Katz 1988; Low 2005	‐0.05 (‐0.13 to 0.03)	0%; 0.71, P value = 0.40
Information booklet vs. simple patient referral	1	633	Kissinger 2005	0.22 (0.08 to 0.36)	n/a
Videotape vs. simple patient referral	1	12,677	Trent 2010	not reported	n/a

Enhanced patient referral group is taken as the experimental group. Mean difference (MD) < 0 indicates that simple patient referral resulted in more partners treated; MD = 0 indicates no difference between groups; MD > 0 indicates more partners treated in the enhanced patient referral group.

CI: confidence interval; MD: mean difference; n/a indicates not applicable.