Table 2.
Carbon monoxide-verified past 1-day and 7-day smoking abstinencea by study arm
| Past 1-day abstinence | Past 7-day abstinence b | |||||||
|---|---|---|---|---|---|---|---|---|
| All or part of cigarette | Puff of cigarette | All or part of cigarette | Puff of cigarette | |||||
| Study day | Control | Incentives | Control | Incentives | Control | Incentives | Control | Incentives |
| 3 | 8 | 24 | 4 | 12 | – | – | – | – |
| 5 | 0 | 20 | 0 | 12 | – | – | – | – |
| 7 | 8 | 40 | 0 | 24 | 4 | 4 | 0 | 0 |
| 10 | 12 | 28 | 4 | 8 | – | – | – | – |
| 12 | 16 | 20 | 4 | 8 | – | – | – | – |
| 14 | 12 | 32 | 4 | 4 | 12 | 8 | 4 | 0 |
| 17 | 8 | 32 | 0 | 16 | – | – | – | – |
| 21 | 4 | 40 | 0 | 16 | 0 | 16 | 0 | 0 |
| 24 | 4 | 48 | 4 | 20 | – | – | – | – |
| 28 | 8 | 36 | 4 | 20 | 8 | 20 | 0 | 4 |
| 35 | 12 | 20 | 4 | 12 | 8 | 16 | 0 | 4 |
| 42 | 8 | 32 | 0 | 8 | 8 | 8 | 0 | 0 |
| 49 | 8 | 20 | 0 | 0 | 4 | 12 | 0 | 0 |
| 56 | 4 | 28 | 0 | 8 | 4 | 24 | 0 | 0 |
| Effect, Incentives vs. Control | OR 4.93 (95% CI 1.72 to 14.1) |
OR 6.68 (95% CI 1.33 to 33.6) |
OR 2.45 (95% CI 0.55 to 10.8) |
OR 2.01 (95% CI 0.13 to 31.0) |
||||
Abbreviations: CI, confidence interval; OR, odds ratio.
aAll table values are percentages. Individuals with missing carbon monoxide or self-reported smoking data are assumed not to meet the criteria for abstinence.
bOnly data from the 8 Friday assessment visits are included to avoid overlapping 7-day reference periods.