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Table 1 Response rates for Incentives

From: Differential effects of pre and post-payment on neurologists' response rates to a postal survey

Incentive

First Round (300 replies)

Second Round (51 replies)

Aggregate (351 replies, 59%)

Token Sent (n = 214)

131/214 (61%)

20/83 (24%)

151/214 (71%)

Token Promised (n = 147)

71/147 (48%)

8/76 (11%)

79/147 (54%)

No Token (n = 230)

98/230 (43%)

23/132 (17%)

121/230 (53%)

Difference

p = 0.0004

p = 0.08

p = 0.0002