Table 1.
Sample characteristics according to incentive schemes at baseline (n = 1246)
| No incentive (n = 316) | Promised HK$100 incentive (n = 326) | Promised HK$200 incentive (n = 283) | Mixed incentive (n = 321) | P-value | |
|---|---|---|---|---|---|
| Sex | 0.82 | ||||
| Male | 264 (83.8) | 277 (85.0) | 243 (85.9) | 268 (83.5) | |
| Female | 51 (16.2) | 49 (15.0) | 40 (14.1) | 53 (16.5) | |
| Age group (years) | 0.49 | ||||
| < =39 | 59 (18.9) | 51 (15.6) | 51 (18.0) | 64 (19.9) | |
| 40–59 | 132 (42.0) | 134 (41.1) | 102 (36.0) | 129 (40.2) | |
| > =60 | 123 (39.2) | 141 (43.3) | 130 (45.9) | 128 (39.9) | |
| Education level | |||||
| Primary or below | 63 (20.2) | 71 (21.8) | 69 (24.4) | 69 (21.6) | 0.80 |
| Secondary | 189 (60.6) | 188 (57.7) | 159 (56.2) | 178 (55.8) | |
| Tertiary | 60 (19.2) | 67 (20.6) | 55 (19.4) | 72 (22.6) | |
| Marital status | 0.57 | ||||
| Single | 63 (20.2) | 53 (16.3) | 50 (17.9) | 66 (20.8) | |
| Married / Cohabit | 222 (71.2) | 233 (71.5) | 198 (70.7) | 215 (67.8) | |
| Divorced/Separated/Widowed | 27 (8.7) | 40 (12.3) | 32 (11.4) | 36 (11.4) | |
| Employment status | 0.31 | ||||
| Employed | 182 (58.1) | 180 (55.4) | 139 (50.4) | 186 (58.3) | |
| Retired | 100 (31.9) | 119 (36.6) | 105 (38.0) | 100 (31.4) | |
| Others | 31 (9.9) | 26 (8.0) | 32 (11.6) | 33 (10.3) | |
| Monthly household income (HKD; US$1 = HK$7.8) | 0.29 | ||||
| Below $10,000 | 65 (23.4) | 57 (19.8) | 54 (21.9) | 52 (18.7) | |
| $10,000–$29,999 | 95 (34.2) | 99 (34.4) | 101 (40.9) | 96 (34.5) | |
| $30,000 or above | 118 (42.4) | 132 (45.8) | 92 (37.2) | 130 (46.8) | |
| Had children | 219 (71.3) | 246 (76.4) | 209 (75.5) | 220 (69.8) | 0.19 |
| Had children under 16 years | 46 (15.0) | 65 (20.3) | 55 (20.0) | 54 (17.1) | 0.28 |
| Place of origin | 0.57 | ||||
| Hong Kong | 181 (58.4) | 188 (58.6) | 164 (58.8) | 200 (63.5) | |
| China Mainland | 118 (38.1) | 127 (39.6) | 108 (38.7) | 105 (33.3) | |
| Others | 11 (3.5) | 6 (1.9) | 7 (2.5) | 10 (3.2) | |
| Perceived health status | 1.00 | ||||
| Extremely /very good | 85 (27.6) | 99 (30.8) | 79 (28.4) | 92 (29.1) | |
| Good | 83 (26.9) | 80 (24.9) | 79 (28.4) | 82 (25.9) | |
| Fair | 115 (37.3) | 117 (36.4) | 97 (34.9) | 118 (37.3) | |
| Bad | 25 (8.1) | 25 (7.8) | 23 (8.3) | 24 (7.6) | |
| Time to first smoking after waking | 0.57 | ||||
| <5 min | 72 (26.2) | 76 (25.5) | 71 (28.1) | 75 (25.8) | |
| 6–30 min | 69 (25.1) | 84 (28.2) | 71 (28.1) | 91 (31.3) | |
| 31–60 min | 37 (13.5) | 29 (9.7) | 31 (12.3) | 40 (13.7) | |
| After 60 min | 97 (35.3) | 109 (36.6) | 80 (31.6) | 85 (29.2) | |
| Daily cigarette users | 0.11 | ||||
| Yes | 256 (82.1) | 250 (77.2) | 240 (84.8) | 261 (81.6) | |
| No | 56 (17.9) | 74 (22.8) | 43 (15.2) | 59 (18.4) | |
| Daily cigarette consumption (sticks) | 0.17 | ||||
| 1–10 | 149 (52.5) | 150 (53.8) | 111 (43.4) | 145 (49.8) | |
| 11–20 | 114 (40.1) | 115 (41.2) | 126 (49.2) | 118 (40.5) | |
| 21–30 | 13 (4.6) | 11 (3.9) | 13 (5.1) | 16 (5.5) | |
| >30 | 8 (2.8) | 3 (1.1) | 6 (2.3) | 12 (4.1) | |
| Intention to quit | 0.93 | ||||
| No intention | 169 (54.9) | 172 (54.6) | 153 (55.4) | 177 (56.5) | |
| Within 30 days | 49 (15.9) | 54 (17.1) | 41 (14.9) | 42 (13.4) | |
| After 30 days | 90 (29.2) | 89 (28.3) | 82 (29.7) | 94 (30.0) | |
| Ever used Ecigs or HTP | 0.24 | ||||
| Yes | 72 (22.8) | 72 (22.1) | 50 (17.7) | 78 (24.3) | |
| No | 244 (77.2) | 254 (77.9) | 233 (82.3) | 243 (75.7) | |
Mixed incentive: Prepaid HK$100 incentive and promised HK$100 incentive; Ecigs or HTP: E-cigaretes or heated tobacco products; Sample sizes varied because missing responses on some variables were not included in the percentage calculation. P-value calculated by Chi-squared test for categorical variables. All differences were due to chance (from randomization), and P values are for reference only