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Table 2 Consent and retention rates at 3-month follow-up according to incentive schemes (n = 1246)

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

Incentive schemes Consent rate n (%) Risk ratio (95% CI) P-value Retention rate n (%) Risk ratio (95% CI) P-value
All (n = 1246) 462 (37.1)    287 (23.0)   
 No incentive 114/316 (36.1) Ref   64/316 (20.3) Ref  
 Promised HK$100 110/326 (33.7) 0.94 (0.76, 1.16) 0.54 69/326 (21.2) 1.05 (0.77, 1.41) 0.78
 Promised HK$200 107/283 (37.8) 1.05 (0.85, 1.29) 0.66 68/283 (24.0) 1.19 (0.88, 1.60) 0.27
 Mixed incentive 131/321 (40.8) 1.13 (0.93, 1.38) 0.22 86/321 (26.8) 1.32 (1.00, 1.76) 0.053
Participants who consented (n = 462)    287 (62.1)  
 No incentive 64/114 (56.1) Ref  
 Promised HK$100 69/110 (62.7) 1.12 (0.90, 1.39) 0.21
 Promised HK$200 68/107 (63.6) 1.13 (0.91, 1.41) 0.20
 Mixed incentive not receiving prepaid 33/67 (49.3) 0.88 (0.66, 1.18) 0.38
 Mixed incentive receiving prepaid 53/64 (82.8) 1.48 (1.21, 1.80) <0.01
  1. HK$100 = US$12.8; Incentive-mix: Prepaid HK$100 incentive and promised HK$100 incentive
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