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Table 1 Sample characteristics according to incentive schemes at baseline (n = 1246)

From: Effect of prepaid and promised financial incentive on follow-up survey response in cigarette smokers: a randomized controlled trial

  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)  
  1. 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
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