Table 1.

Text Message Fidelity and Treatment Engagement Outcomes by Study Arm

	BA	NRT	TM	TM + NRT
	N = 39	N = 36	N = 39	N = 39
	Mean [SD]
Text message fidelity
No. of text messages sent to patient	—	—	160.4 [54.5]	158.0 [72.0]
Text message engagement
Days in text message programa	—	—	63.7 [19.5]	59.2 [24.0]
No. of text messages sent from patient	—	—	17.4 [11.9]	19.6 [22.4]
HELP requests sent by patient	—	—	0.4 [0.7]	0.2 [0.7]
No. of URL links clicked	—	—	3.8 [8.0]	2.1 [3.9]
Proportion URL links clicked/links sent	—	—	21.8 [49.2]	13.7 [28.2]
NRT engagement
Week 1 milligrams of NRT	—	33.8 (54.8)	—	22.3 (45.8)
Week 2 milligrams of NRT	—	84.2 (81.2)	—	58.0 (91.3)
Days of NRT use, weeks 1 and 2		5.3 (4.4)		3.3 (4.3)

BA = brief advice; NRT = nicotine replacement therapy; TM = text messages; TM + NRT = text messages and nicotine replacement therapy.

^aDays from enrollment in program until user texted STOP or program ended.