Table 3.
Smoking cessation and engagement with cessation program at 2-month follow-up with the Modified-Intention-to-Treat analysis. Results are adjusted for 2 stratification factors (heavy smoking and education). Cessation results are adjusted for baseline self-efficacy.
| Outcome variable | Overall (N=266) | Control (n=151) | Intervention (n=115) | ORa/IRRb/estimatec (95% CI) | P value | |
| Engagement with app | ||||||
| Number of log-ins, mean (SD) | 30.14 (38.13) | 28.48 (41.13) | 32.31 (34.00) | 1.08 (0.83 to 1.42) | .55 | |
| Number of days used, mean (SD) | 17.46 (18.10) | 15.46 (16.91) | 20.1 (19.31) | 4.14 (−0.23 to 8.50) | .06 | |
| Completion certificate, n (%) | 116 (44) | 58 (38) | 58 (50) | 1.58 (0.86 to 2.59) | .07 | |
| Number of Acceptance and Commitment Therapyd exercises completed, mean (SD) | 17.41 (22.32) | 15.48 (18.02) | 19.96 (26.82) | 3.72 (−1.66 to 9.11) | .18 | |
| Smoking cessation | ||||||
| 30-day PPAe, complete case, n (%) | 42 (17) | 19 (13) | 23 (21) | 2.13 (1.06 to 4.27) | .03 | |
| 30-day PPA, missing=smoking, n (%) | 42 (16) | 19 (13) | 23 (20) | 2.10 (1.45 to 4.19) | .03 | |
| Change in cigarettes per day, mean (SD) | −4.15 (7.74) | −3.53 (7.57) | −4.96 (7.96) | −1.26 (−3.97 to 1.27) | .33 | |
| Change in Fagerström Test for Nicotine Dependence | −1.48 (1.91) | −1.18 (1.69) | −1.88 (2.12) | −0.78 (−1.45 to −0.11) | .02 | |
aOR: odds ratio in logistic regression for binary variables.
bIRR: incident rate ratio in negative binomial regression for count variables (ie, number of times logged in and length of use of website).
cPoint estimate: difference between arms for continuous variables.
dModules inside SmartQuit.
ePPA: point prevalence abstinence.