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Table 2 Response rates between incentive payment groups

From: The effect of timing of incentive payments on response rates for cohort study telephone interviews in primary care setting with cost-minimization analysis, a randomized controlled trial

  Up-front payment group Delayed payment group Chi-square test
Patients contacted (n) 600 623  
Patients who refused to join the study n (%) 240 (40 %) 263 (42 %) p = 0.433
Patients who agreed to join the study n (%) 360 (60 %) 360 (58 %)
Baseline interview n (%)
 Successfully interviewed 259 (71.9 %) 260 (72.2 %) p = 0.938
 Failed to contact 101 (28.1 %) 100 (27.8 %)
12-Month follow-up interview n (%)
 Successfully interviewed 201 (77.6 %) 205 (78.8 %) p = 0.751
 Failed to contact 58 (22.4 %) 55 (21.2 %)