Table 4.
Associations between app usage during the first 30 days and smoking cessation outcomes from 30- and 90-day surveys for full trial participants. To provide meaningful comparisons, estimates are given for the third versus first quartiles of the main exposures. Influential observations removed: Results of sensitivity analyses (adjusted models).
| Self-reported smoking abstinence |
Complete audio listens, ORa (95% CI) | Days answering questions, OR (95% CI) | ||||||
| Unadjusted | Adjustedb | Influential observations removedc |
Unadjusted | Adjusted | Influential observations removed |
|||
| 30-day survey (n=68) | ||||||||
| 7 days | 1.57 (0.62-3.95) P=.34 | 1.78 (0.61-5.23) P=.29 | 1.51 (0.35-6.48) P=.58, n=63 | 1.28 (0.49-3.31) P=.62 | 1.63 (0.52-5.14) P=.40 | 1.21 (0.26-5.62) P=.81, n=63 | ||
| 30 days | 1.31 (0.44-3.87) P=.63 | 1.33 (0.37-4.69) P=.66 | 4.35 (0.36-52.08) P=.25, n=61 | 0.79 (0.25-2.52) P=.69 | 0.86 (0.22-3.38) P=.83 | 0.87 (0.10-7.63) P=.90, n=61 | ||
| 90-day survey (n=66) | ||||||||
| 7 days | 2.84 (1.05-7.66) P=.04 |
3.04 (1.07-8.67) P=.04 |
4.19 (1.36-12.97) P=.01, n=62 |
2.54 (0.96-6.67) P=.06 |
3.17 (1.07-9.38) P=.04 |
6.27 (1.62-24.27) P=.01, n=62 |
||
| 30 days | 2.37 (0.87-6.46) P=.09 |
3.06 (1.00-9.35) P<.05 |
9.12 (1.99-41.79) P<.01, n=61 |
1.79 (0.67-4.79) P=.25 |
2.55 (0.82-7.95) P=.11 |
3.87 (1.09-13.73) P=.04, n=64 |
||
| 90 days | 1.93 (0.55-6.77) P=.30 |
2.91 (0.63-13.43) P=.17 |
3.61 (0.83-15.80) P=.09, n=56 |
1.03 (0.29-3.70) P=.96 |
1.65 (0.36-7.65) P=.52 |
N/Ad,e |
||
aOR: odds ratio.
bModels adjusted for age, race, mental imagery, weight concern, and tobacco dependence.
cn: number of observations remaining after exclusion of influential observations.
dN/A: not applicable.
eResults were unreliable as nearly all (9 of 10) individuals with reported smoking cessation were flagged as influential.