Table 2.

Texts and mean percentage of daily responses among participants by protocol and data collection period.^a

	Protocol A Signal-based sampling		Protocol B Event-based sampling
	Participants, n (texts, n)	Mean text response rate, % (range, %)	Participants, n (texts, n)	Mean text response rate, % (range, %)
Round 1	7 (4963)	99 (94-100)	7 (2009)	96 (94-100)
Round 2	11 (6328)	84 (47-100)	8 (2746)	11 (11-100)
Round 3	2 (323)	53 (40-100)	5 (1925)	56 (13-87)

^aOnly participants who responded to at least one survey occasion during the round of surveys were included in these numbers.