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. Author manuscript; available in PMC: 2019 May 1.
Published in final edited form as: Addiction. 2018 Jan 26;113(5):914–923. doi: 10.1111/add.14127

Table 2.

Smoking cessation outcomes at 12-month follow-up.

Outcome Variable Overall (n=2637) Smokefree (n=1318) WebQuit (n=1319) OR (95% CI)3 p-value
30-day PPA, complete case1, n (%) 583 (25%), n=2309 305 (26%), n=1168 278 (24%), n=1141 0.91 (0.76, 1.10) 0.334
30-day PPA, missing=smoking2, n (%) 583 (22%) 305 (23%) 278 (21%) 0.89 (0.74, 1.07) 0.200
7-day PPA, complete case, n (%) 709 (31%), n=2309 369 (32%), n=1168 340 (30%)., n=1141 0.92 (0.77, 1.10) 0.393
7-day PPA, missing=smoking, n (%) 709 (27%) 369 (28%) 340 (26%) 0.89 (0.75, 1.06) 0.393
1

Complete case analysis (i.e., exclusion of participants lost to follow-up) was specified a priori as the primary outcome.

2

The missing=smoking outcomes are provided as recommended by the Russell Standard.

3

Odds ratios are adjusted for the three factors used in stratified randomization: daily smoking frequency, education, and gender.