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. 2015 Jul 29;17(7):e189. doi: 10.2196/jmir.3898

Table 3.

Survey outcomes by intervention arm.

Survey outcomes Control (n=991),
n (%) or median (IQRa)		 Incentive (n=859),
n (%) or median (IQR)		 P b
Response ratec, n (%) 329 (33.2) 337 (39.2) .01
Eligible responders completing survey, n (%) 892 (90.0) 807 (94.0) .06
Days to response among eligible responders,
median (IQR)		 6.6 (0.3-22.3) 0.8 (0.2-14.4) .001
Minutes spent completing survey, median (IQR) 3.9 (2.5-5.5) 3.9 (2.4-5.5) .56

aInterquartile range (IQR).

bCalculated using the chi-square test for proportions and the Wilcoxon-Mann-Whitney test for continuous variables.

cResponse rate calculated in accordance with response rate three (RR3) defined by the American Association for Public Opinion Research guidelines for Internet surveys of specifically named persons [27].