Table 1.

Importance of recruitment and retention strategies compared with provision of rideshare services (N= 32).

Variables		Recruitment and retention strategies
		Mean (SD)	t test	P value
Reasons for study completion
	Rideshare service was provideda	5.75 (1.70)	—b	—
	The study visits were in the evening	5.47 (1.90)	0.64	.53
	The staff was nice	6.47 (1.30)	−2.26	.03
	I received reminder short message service (SMS) text messages	4.97 (1.84)	2.60	.01
	I received reminder calls from staff	4.66 (1.81)	2.86	.01
	Alcohol was provided at study visits	4.56 (2.23)	2.65	.01
	Hookah was provided at study visits	5.28 (1.42)	1.17	.25
	The compensation was fair	6.28 (0.96)	−1.78	.08
	I would feel bad if I did not attend all visits	5.72 (1.69)	0.07	.94
	I got to complete study with my friend	6.31 (0.90)	−1.74	.09
	The study visits were fun	6.47 (0.88)	−2.35	.03
Intentions for future study participation
	Rideshare service was provideda	4.13 (0.75)	—	—
	The study visits were in the evening	4.38 (0.71)	−1.61	.12
	The staff was nice	4.56 (0.62)	−2.95	.01
	I received reminder SMS text messages	4.06 (0.67)	0.44	.66
	I received reminder calls from staff	3.88 (0.79)	1.54	.13
	Alcohol was provided at study visits	4.25 (0.84)	−0.89	.38
	Hookah was provided at study visits	4.13 (0.79)	0.00	>.99
	The compensation was fair	4.81 (0.40)	−4.98	<.01
	I got to complete study with my friend	4.63 (0.55)	−3.22	.003
	The study visits were fun	4.69 (0.54)	−3.97	<.001

^aReasons for study completion were measured on a 1 (not at all important) to 7 (extremely important) scale. Intention for future study participation were measured on a 1 (strongly disagree) to 5 (strongly agree) scale.

^bAll t tests compared use or rideshare to each other strategy, therefore no values are included for the rideshare test as there is no comparator.