Table 7. Comparing adjusted ORs for the effect of e-cigarette, smokeless tobacco or snus use on quitting in the main and sensitivity analyses.
| Wave 1 to 2/3 quitting | Wave 2 to 3/4 quitting | Wave 1 to 2/3/4 quitting | |||||
|---|---|---|---|---|---|---|---|
| Type of quitting | Model | N (n) | OR (95% CI) | N (n) | OR (95% CI) | N (n) | OR (95% CI) |
| Delayed | Main | 448 (65) | 1.38 (1.03-1.85) | 392 (91) | 1.25 (0.97-1.62) | 606 (89) | 1.43 (1.10-1.85) |
| Sensitivity 5 | 377 (56) | 1.50 (1.11-2.04) | 352 (84) | 1.28 (0.99-1.67) | 538 (83) | 1.53 (1.18-1.99) | |
| 6 | 261 (40) | 1.26 (0.86-1.86) | 222 (61) | 1.21 (0.87-1.66) | 344 (50) | 1.21 (0.85-1.72) | |
| 7 | 449 (41) | 1.16 (0.71-1.90) | 396 (42) | 1.07 (0.77-1.51) | 603 (61) | 1.42 (1.05-1.91) | |
| 8 | 476 (21) | 1.79 (0.91-3.53) | 394 (18) | 1.16 (0.68-1.97) | 608 (22) | 1.32 (0.80-2.19) | |
| Temporary | Main | 201 (24) | 0.93 (0.59-1.46) | 195 (55) | 1.60 (1.14-2.25) | 349 (48) | 1.26 (0.89-1.77) |
| Sensitivity 5 | 142 (20) | 1.29 (0.79-2.09) | 134 (39) | 1.69 (1.14-2.53) | 258 (37) | 1.31 (0.90-1.91) | |
| 6 | 210 (24) | 0.93 (0.58-1.47) | 195 (55) | 1.24 (0.87-1.75) | 282 (44) | 1.48 (1.01-2.16) | |
| 7 | 199 (18) | 1.16 (0.69-1.96) | 192 (30) | 1.79 (1.19-2.68) | 345 (32) | 1.14 (0.75-1.73) | |
| 8 | 208 (9) | 1.96 (0.97-3.96) | 193 (19) | 3.29 (1.98-5.46) | 347 (16) | 1.93 (1.08-3.43) | |
| Sustained | Main | 380 (54) | 1.51 (1.09-2.08) | 344 (86) | 1.48 (1.13-1.94) | 272 (33) | 1.52 (1.02-2.26) |
| Sensitivity 5 | 289 (35) | 1.36 (0.94-1.97) | 243 (62) | 1.50 (1.11-2.02) | 206 (22) | 1.46 (0.93-2.31) | |
| 6 | 425 (57) | 1.45 (1.03-2.05) | 350 (87) | 1.17 (0.88-1.56) | 281 (33) | 1.45 (0.95-2.22) | |
| 7 | 385 (38) | 1.57 (1.04-2.35) | 343 (37) | 1.04 (0.71-1.50) | 269 (28) | 1.76 (1.14-2.72) | |
| 8 | 423 (19) | 2.30 (1.28-4.14) | 345 (12) | 0.80 (0.43-1.52) | 272 (11) | 1.99 (0.99-3.98) | |
N = total number quitting for the given type
n = number of quitters among users
Main Comparison of ever and never regular e-cigarette users
Sensitivity 5 As main, but relates to 30-day quitting at the relevant wave
Sensitivity 6 As main, but excluding those not attempting to quit in first year of follow-up
Sensitivity 7 As main, but comparison of ever and never smokeless tobacco users
Sensitivity 8 As main, but comparison of ever and never snus users