Table 3.

Associations between baseline characteristics and usage outcomes. App-based analytics for full trial participants (n=73) over the study period, as incidence rate ratios (IRR); results of sensitivity analysis, where influential observations are removed, are included.

Characteristic		Daily questions answered, IRRa (95% CI)				Audio files completed, IRR (95% CI)
		Unadjusted	Adjustedb	Influential observations removedc	Unadjusted		Adjusted	Influential observations removed
Age (per 10 years)		1.05 (0.87-1.26) P=.64	1.07 (0.89-1.30) P=.46	1.07 (0.89-1.30) P=.46, n=73	1.15 (0.96-1.38) P=.13		1.18 (0.98-1.42) P=.07	1.26 (1.05-1.51) P=.01, n=70
Race
	White	Ref	Ref	Ref	Ref		Ref	Ref
	Other	1.16 (0.69-2.06) P=.59	1.25 (0.71-2.29) P=.43	1.25 (0.71-2.29) P=.43, n=73	1.02 (0.61-1.77) P=.95		1.23 (0.71-2.20) P=.44	0.86 (0.50-1.52) P=.44, n=70
Time to smoke after waking		P=.57	P=.72	P=.39	P=.18		P=.67	P=.17
	<5 min	0.90 (0.31-2.16)	0.92 (0.31-2.33)	1.53 (0.48-4.04) n=71	0.69 (0.26-1.60)		0.81 (0.30-1.96)	0.90 (0.31-2.22) n=68
	5-30 min	1.29 (0.46-3.02)	1.28 (0.46-2.99)	2.06 (0.67-5.17) n=71	1.26 (0.48-2.85)		1.19 (0.45-2.69)	1.62 (0.58-3.83) n=68
	31-60 min	0.90 (0.30-2.32)	0.90 (0.30-2.37)	1.26 (0.38-3.50) n=71	0.82 (0.29-2.04)		0.89 (0.32-2.20)	0.92 (0.31-2.44) n=68
	>60 min	Ref	Ref	Ref	Ref		Ref	Ref
Concern about weight gaind		0.89 (0.71-1.12) P=.32	0.91 (0.72-1.15) P=.43	0.88 (0.69-1.11) P=.25, n=68	0.83 (0.66-1.05) P=.09		0.85 (0.68-1.06) P=.13	0.78 (0.62-0.97) P=.02, n=69
Mental imagery usee		0.93 (0.76-1.16) P=.47	0.93 (0.76-1.17) P=.50	0.87 (0.69-1.11) P=.19, n=71	0.98 (0.81-1.22) P=.85		1.00 (0.83-1.23) P=.78	0.84 (0.69-1.05) P=.09, n=67

^aIRR: incidence rate ratios.

^bModel adjusted for age and race.

^cn: number of observations remaining after exclusion of influential observations.

^d1=low to 5=high.

^e1=Never to 5=More than 30 min.