Table 2.

Retention rates (n=4027).

Follow-up survey	Overall (n=4027)		Arm 1 (n=1313)		Arm 2 (n=1400)		Arm 3 (n=1314)
	n	%	n	%	n	%	n	%
3-week	3009	74.72	949	72.28	1071	76.50	989	75.27
8-week	2881	71.54	925	70.45	1024	73.14	932	70.93
20-week	2675	66.42	866	65.96	957	68.36	852	64.84
32-week	2603	64.64	846	64.43	933	66.64	824	62.71
Completed no follow-up surveys	805	19.99	292	22.23	256	18.29	257	19.56
Completed all follow-up surveys	2282	56.67	746	56.82	818	58.43	718	54.64