Table 2.
Factors Observed During Tourniquet Application
| Outcome | No Preexposure (n = 131) | Preexposure (n = 95) | RR (95% CI) | p‐value | ||||
|---|---|---|---|---|---|---|---|---|
| Total | Instruction Card | Instruction Card and Audio | Total | Instruction Card and Mobile app | Instruction Card and Mobile App + Audio | |||
| Successful application, n (%) | 66 (50) | 30 | 36 | 71 (75) | 35 | 36 | 1.48 (1.21–1.82) | <0.05 |
| Seconds to successfully apply tourniquet, median (IQR) | 107 (68–147) | 91.5 | 110 | 100 (73–128) | 90 | 101 | — | 0.17 |
| Reason for failure (% of failures) | ||||||||
| Total number of failures | 65 (50) | 35 | 30 | 24 (39) | 11 | 13 | 0.51 (0.35–0.75) | <0.05 |
| Incorrect position | 6 (5) | 3 | 3 | 3 (3) | 2 | 1 | 0.65 | |
| Device too loose | 61 (47) | 34 | 27 | 21 (22) | 10 | 11 | 0.33 | |
| No all steps completed | 31 (24) | 18 | 13 | 14 (15) | 7 | 7 | 0.38 | |
| Subject requested to stop early | 3 (2) | 3 | 0 | 1 (1) | 0 | 1 | 0.93 | |
| Time (>7 minutes) | 2 (2) | 1 | 1 | 0 | 0 | 0 | — | — |
| Multiple reasons (any combination) | 31 (24) | 19 | 12 | 11 (12) | 6 | 5 | 0.78 | |
IQR = interquartile range; RR = risk ratio.