Characteristics of completion | First recall (N = 156) | Second recall (N = 45) |
---|---|---|
Response rate overall, n (%) | 163/471 (34.6) | 46/78 (59.0) |
Response rate pre-incentive, n (%) | 105/311 (33.8) | 20/39 (51.3) |
Response rate post-incentive, n (%) | 58/160 (36.3) | 26/39 (66.7) |
Number of attempts to complete, n (%) | ||
1 | 144 (92.3) | 45 (100) |
2 | 12 (7.7) | 0 (0) |
Recall indicative of normal intake, n (%) | ||
Much more than usual intake | 4 (2.6) | 0 (0) |
Usual intake | 144 (92.3) | 43 (95.6) |
Much less than usual intake | 8 (5.1) | 2 (4.4) |
Time between receiving email invitation and completing recall (days), median (IQR) | 2.0 (7.5) | 7.0 (7.0) |
Total recall session duration (min), median (IQR) | 29.5 (17.0) | 23.0 (14.0) |
Number of foods reported, median (IQR) | 18.0 (6.0) | 18.0 (8.0) |