Table 2.

Correlations between percentages of days abstinent and mechanisms of behavioral change (MOBC) domains measured on brief, remotely completed weekly check-ins and MOBC domains measured on longer, psychometrically validated instruments completed at research appointments.

MOBC domain		Cross-sectional correlation between MOBC measure and percentage of days abstinent, both measured at 6 months				Longitudinal correlation between changes in MOBC measure and changes in percentage of days abstinent, both examined from baseline to 6 months
		r (95% CI)	Number of observations included in the analysis	P value	r (95% CI)		Number of observations included in the analysis	P value
Coping strategies
	Weekly check-in	0.45 (0.09 to 0.70)	28	.02	0.42 (0.05 to 0.68)		28	.03
	Research appointmentsa	0.40 (−0.14 to 0.76)	15	.14	0.36 (−0.27 to 0.77)		12	.25
Abstinence self-efficacy
	Weekly check-in	0.62 (0.33 to 0.81)	28	<.001	0.26 (−0.13 to 0.57)		28	.19
	Research appointments	0.58 (0.27 to 0.79)	28	.001	0.26 (−0.12 to 0.58)		28	.18
Craving
	Weekly check-in	−0.25 (−0.57 to 0.13)	28	.19	−0.29 (−0.60 to 0.10)		27	.14
	Research appointments	−0.58 (−0.78 to −0.25)	27	.002	−0.37 (−0.66 to 0.01)		27	.06
Depression
	Weekly check-in	−0.02 (−0.39 to 0.36)	28	.94	−0.26 (−0.58 to 0.12)		28	.18
	Research appointments	−0.11 (−0.46 to 0.28)	28	.58	−0.29 (−0.60 to 0.09)		28	.13
Therapeutic alliance
	Weekly check-in	0.26 (−0.13 to 0.58)	28	.18	0.49 (0.14 to 0.73)a		28	.008
	Research appointments	0.31 (−0.07 to 0.61)	28	.11	0.54 (0.21 to 0.76)a		28	.003

^aA standardized questionnaire for coping strategies was only added to the research appointment assessment battery midway through the study because of initial concerns about potential assessment fatigue to patients (ie, the Coping Strategies Scale contains 59 items). Therefore, it was only available at baseline for the last 14 enrolled patients and at the 6-month follow-up for the last 16 enrolled patients, one of whom declined to complete the study due to assessment fatigue.