Table 2 Evaluation of electronic cigarettes effectiveness
Conventional cigarette (CCs) Consumption and exhaled carbon monoxide (CO) Level at baseline | ||||
Characteristics | Dual users n = 146 | Sole EC users n = 69 | Statistic | P value (2-tailed) |
CC/day before using EC | 20 (10–60) | 20 (5–40) | U = 4412.000 | 0.055 |
CC/day at baseline visit 1 | 5 (1–30) | – | Z = −9.281 | < 0.001 |
Exhale Carbon Monoxide (CO) | 8 (8–40) | 3 (1–6) | U = 1577.500 | < 0.001 |
Conventional cigarettes consumption and CO level at week 24 | ||||
Characteristics | Dual users n = 127 | Sole EC users n = 62 | Statistic | P value (2-tailed) |
CC/day at baseline vs week 24 | 5 (1–30) | – | Z = −1.710 | 0.087 |
CC/day at week 24 | 6 (0–40) | 0 (0–20) | U = 1842.00 | < 0.001 |
CO at week 24 | 8 (2–20) | 3 (2–11) | U = 1650.50 | < 0.001 |
Evaluation of Electronic cigarettes effectiveness by the seven-day prevalence abstinence rate at week 24 (Intention To Treat (ITT) analysis) | ||||
At Week 24 | % (n) | OR (95% CI) | P value (2-tailed) | |
Quit only CCs | ||||
Both users | 20.5% (44 of 215) | |||
Sole EC users | 42% (29 of 69) | 6.33 (4.09- | < 0.001 | |
Dual user | 10.3% (15 of 146) | 0.646) | ||
Quit both ECs and CCs | ||||
Both users | 3.3% (7 of 215) | 5.62 (5.29- | 0.036 | |
Sole EC users | 7.2% (5 of 69) | 0.940) | ||
Dual users | 1.4% (2 of 146) | |||