Table III.

Analysis of study outcomes and engagement by endorsement of reasons for participating (results shown in bold are significant)

		Financial incentives		Education/insight		Quit assistance		Research/altruism
	Total	Mentioned M (SD)	Not mentioned M (SD)	Mentioned M (SD)	Not mentioned M (SD)	Mentioned M (SD)	Not mentioned M (SD)	Mentioned M (SD)	Not mentioned M (SD)
Week 26 outcomes
Motivation to quit	228	5.22 (3.59)	5.52 (3.61)	5.43 (3.49)	5.36 (3.68)	7.08 (3.13)†	4.80 (3.57)†	4.76 (3.37)*	5.87 (3.70)*
Confidence to quit	228	6.20 (3.41)	6.12 (3.21)	6.25 (3.01)	6.09 (3.47)	7.00 (2.92)*	5.86 (3.37)*	5.63 (3.39)*	6.55 (3.17)*
	Total	% (n)	% (n)	% (n)	% (n)	% (n)	% (n)	% (n)	% (n)
Any quit attempt since baseline
Yes	138	38.4 (53)*	61.6 (85)*	44.2 (61)	55.8 (77)	32.6 (45)†	67.4 (93)†	35.5 (49)**	64.5 (89)**
No	117	52.1 (61)*	47.9 (56)*	35.0 (41)	65.0 (76)	13.7 (16)†	86.3 (101)†	52.1 (61)**	47.9 (56)**
Verified quit
Yes	11	18.2 (2)	81.8 (9)	45.5 (5)	54.5 (6)	36.4 (4)	63.6 (7)	18.2 (2)	81.8 (9)
No	244	45.9 (112)	54.1 (132)	39.8 (97)	60.2 (147)	23.4 (57)	76.6 (187)	44.3 (108)	55.7 (136)
Study engagement	Total	% (n)	% (n)	% (n)	% (n)	% (n)	% (n)	% (n)	% (n)
Completed all counseling sessions
Yes	171	46.2 (79)	53.8 (92)	39.2 (67)	60.8 (104)	26.3 (45)	73.7 (126)	42.7 (73)	57.3 (98)
No	33	42.4 (14)	57.6 (19)	30.3 (10)	69.7 (23)	18.2 (6)	81.8 (27)	45.5 (15)	54.5 (18)
Completed all assessments
Yes	227	42.7 (97)	57.3 (130)	40.1 (91)	59.9 (136)	26.0 (59)*	74.0 (168)*	42.7 (97)	57.3 (130)
No	28	60.7 (17)	39.3 (11)	39.3 (11)	60.7 (17)	7.1 (2)*	92.9 (26)*	46.4 (13)	53.6 (15)

SD, standard deviation.

*P < 0.05;

**P < 0.01;

†P < 0.001—significance achieved.