Table 2.
Outcome measures in patients undergoing cannulation according to allocation to control (water spray) or intervention (vapocoolant spray). Figures are numbers (percentages) of patients unless specified otherwise
| Control (n=98) | Intervention (n=103) | P value | |
|---|---|---|---|
| Median (IQR) pain with cannulation | 36 (19-51) | 12 (5-40) | <0.001 |
| Cannulation pain ≥30 mm | 59 (60) | 33 (32) | <0.001 |
| Median (IQR) discomfort with spray | 0 (0-0) | 0 (0-11) | <0.001 |
| Successful cannulation | 73 (75) | 83 (81) | 0.390 |
| Future choice of same spray* | 34 (39) | 62 (62) | 0.002 |
| Correct guess at nature of spray | 68 (69) | 56 (54) | 0.001 |
IQR=interquartile range.
*Data missing for 10 in control group and three in intervention group.