Table II. Retention at 6 month visit.

Number and percent of participants who completed the diffusion/contamination evaluation questionnaire, by site, type of participant and study arm.

	Treatment Indexes		Treatment Network members		Control Indexes		Control Network members		Total
	N	%	N	%	N	%	N	%	N	%
Philadelphia
Yes	91	81.3%	172	76.8%	98	81.7%	194	80.8%	555	79.7%
No	21	18.7%	52	23.2%	22	18.3%	46	19.2%	141	20.3%
Total	112		224		120		240		696
Chiang Mai
Yes	87	94.6%	116	95.1%	84	93.3%	112	91.1%	399	93.4%
No	5	5.4%	6	4.9%	6	6.7%	11	8.9%	28	6.6%
Total	92		122		90		123		427
Overall
Yes	178	87.3%	288	83.2%	182	86.7%	306	84.3%	954	85.0%
No	26	12.7%	58	16.8%	28	13.3%	57	15.7%	169	15.0%
Total	204		346		210		363		1123