Table 3 Predictors of consent at baseline and completion of the 3-month follow-up (n = 1246)
Consented to follow-up | Completed follow-up | |||
|---|---|---|---|---|
Predictors | Adjusted risk ratio (95% CI) | P-value | Adjusted risk ratio (95% CI) | P-value |
Incentive schemes | 0.18 | 0.20 | ||
No incentive | Ref | Ref | ||
Promised HK$100 | 0.92 (0.75–1.13) | 0.92 | 1.07 (0.79–1.45) | 0.65 |
Promised HK$200 | 1.09 (0.89–1.34) | 0.46 | 1.23 (0.91–1.66) | 0.18 |
Mixed incentive | 1.14 (0.94–1.38) | 0.20 | 1.33 (1.00–1.77) | 0.05 |
Sex | ||||
Female | Ref | – | – | |
Male | 1.30 (1.08–1.57) | <0.01 | – | – |
Age group (years) | 0.49 | |||
15–29 | Ref | |||
30–39 | 1.02 (0.75, 1.38) | 0.90 | – | – |
40–49 | 1.02 (0.77, 1.36) | 0.87 | – | – |
50–59 | 1.03 (0.78, 1.37) | 0.84 | – | – |
60–65 | 0.78 (0.53, 1.15) | 0.21 | – | – |
Above 65 | 1.05 (0.71, 1.55) | 0.81 | – | – |
Education level | <0.01 | 0.08 | ||
Primary or below | Ref | Ref | ||
Secondary | 1.45 (1.14–1.84) | <0.01 | 1.32 (0.98–1.79) | 0.07 |
Tertiary | 1.66 (1.27–2.17) | <0.01 | 1.47 (1.05–2.07) | 0.03 |
Employment status | 0.14 | |||
Employed | Ref | – | – | |
Others | 1.17 (0.93–1.49) | 0.17 | – | – |
Retired | 1.27 (0.95–1.68) | 0.12 | – | – |
Had children under 16 | 1.28 (1.07–1.54) | <0.01 | – | – |
Place of birth | 0.01 | <0.01 | ||
Hong Kong | Ref | Ref | ||
China Mainland | 0.80 (0.67–0.95) | <0.01 | 0.74 (0.58–0.93) | 0.01 |
Other places | 0.57 (0.32–1.00) | 0.05 | 0.34 (0.12–1.01) | 0.05 |
Intention to quit | <0.01 | 0.08 | ||
No intention | Ref | Ref | ||
Quit after 30 days | 1.37 (1.13–1.65) | <0.01 | 1.13 (0.84–1.52) | 0.43 |
Quit within 30 days | 1.31 (1.11–1.54) | <0.01 | 1.30 (1.04–1.62) | 0.02 |
Ever used Ecigs or HTP | ||||
No | Ref | – | – | |
Yes | 1.07 (0.89–1.28) | 0.49 | – | – |