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Table 2 The effect of incentive timing on six-month follow-up survey completion outcomes in a prospective cohort study

From: Incentive delivery timing and follow-up survey completion in a prospective cohort study of injured children: a randomized experiment comparing prepaid and postpaid incentives

  Incentive timing   
  Before survey
(N = 204)
N (%)
After survey
(N = 216)
N (%)
Overall
(N = 420)
N (%)
P-value1
Response outcome:
 Follow-up survey completed     0.61
  No 65 (31.9) 72 (33.3) 137 (32.6)  
  Yes 139 (68.1) 144 (66.7) 283 (67.4)  
 No. of calls required for contact     0.22
  1 43 (39.1) 62 (49.6) 105 (44.7)  
  2 31 (28.2) 26 (20.8) 57 (24.3)  
  3 17 (15.5) 15 (12.0) 32 (13.6)  
  4 8 (7.3) 8 (6.4) 16 (6.8)  
  5 5 (4.5) 4 (3.2) 9 (3.8)  
  6 3 (2.7) 7 (5.6) 10 (4.3)  
  7 1 (0.9) 2 (1.6) 3 (1.3)  
  8 2 (1.8) 0 (0.0) 2 (0.9)  
  Unknown2 0 (0.0) 1 (0.8) 1 (0.4)  
  1. 1P-value associated with incentive assignment obtained from logistic regression models predicting each individual variable, with incentive assignment and study site as predictors
  2. 2Not included in p-value calculation