TableĀ 5

Absolute benefit of effective strategies to improve retention

Example of proportion of questionnaires returned in control arm30%40%50%60%70%80%90%
Strategy to improve retentionRR1/RR
Addition of monetary incentive vs no incentive1.180.847107927661532
Addition of offer of monetary incentive/prize draw vs no offer1.250.80014012010080604020
Addition of higher value monetary incentive vs addition of lower amount1.120.89077665544332211