6. Enhanced patient referral versus simple patient referral, number of partners notified 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	2	782	Cameron 2009; Ostergaard 2003	0.01 (‐0.12 to 0.14)	0%; 0.01, P value = 0.93
Additional counselling vs. simple patient referral	2	272	Moyo 2002; Wilson 2009	0.21 (0.05 to 0.36) data not available	n/a
Disease‐specific website vs. simple patient referral	1	105	Tomnay 2006	‐0.17 (‐0.68 to 0.35)	n/a
Videotape vs. simple patient referral	1	77	Trent 2010	data not available	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 notified; MD = 0 indicates no difference between groups; MD > 0 indicates more partners notified in the enhanced patient referral group.

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