Table 2 Number of randomisations across audits and time spent on trial components by contamination period
From: The detection and management of attempted fraud during an online randomised trial
Randomisations during the contamination period: | |||
|---|---|---|---|
Yes | No | Total | |
Total randomisations—N | 603 | 638 | 1241 |
Audit | |||
MINAP | 89 (14.8%) | 178 (27.9%) | 267 (21.5%) |
NCABT | 73 (12.1%) | 102 (16.0%) | 175 (14.1%) |
NDA | 380 (63.0%) | 204 (32.0%) | 584 (47.1%) |
PICANet | 33 (5.5%) | 36 (5.6%) | 69 (5.6%) |
TARN | 28 (4.6%) | 118 (18.5%) | 146 (11.8%) |
Time on audit report (seconds) | |||
N—total viewed audit report to end | 597 | 629 | 12261 |
Median (range) | 13.5 (0.5, 14,302.5) | 66.5 (0.5, 70,512.0) | 43.5 (0.5, 70,512.0) |
Interquartile range | (2.0, 60.5) | (31.0, 136.0) | (7.0, 98.5) |
Time on questionnaire (seconds) | |||
N—total completing questionnaire | 547 | 566 | 1113 |
Median (range) | 31.0 (3.5, 19,783.0) | 159.0 (2.5, 16,320.0) | 113.5 (2.5, 19,783.0) |
Interquartile range | (13.0, 139.0) | (97.5, 255.5) | (19.0, 205.0) |
> 20 seconds on questionnaire | |||
Yes | 288 (52.7%) | 545 (96.3%) | 833 (74.8%)2 |
No | 259 (47.3%) | 21 (3.7%) | 280 (25.2%) |
NA—did not complete questionnaire | 56 | 72 | 1281,2 |