Table 3

 Odds ratios for response per $0.01 increase in unconditional incentive in each of five incentive ranges, estimated from a piecewise linear logistic regression model

Incentive rangeOdds ratio for response per $0.01 increase in incentive95% confidence intervalsp Value
$0.01–$0.491.01151.0072, 1.01580.001
$0.50–$0.991.00370.9979, 1.00950.21
$1.00–$1.991.00110.9990, 1.00310.31
$2.00–$4.991.00091.0003, 1.00160.004
$5 and above1.00000.9999, 1.00020.56