Table 2.
Comparison of outcomes in the three groups after the intervention
| Variable | Placebo group, N=50 | Pethidine 5 mg group, N=50 | Pethidine 10 mg group, N=50 | Total, N=150 |
P-value (95% CI) |
|---|---|---|---|---|---|
| Intensity of shivering; n (%) | <0.001* | ||||
| 0 (no shivering) | 25 (50) | 39 (78) | 48 (96) | 112 (74.7) | (67.7–81.6) |
| 1 | 17 (34) | 9 (18) | 2 (4) | 28 (18.7) | (12.5–24.9) |
| 2 | 7 (14) | 2 (4) | 0 | 9 (6) | (2.2–9.8) |
| 3 | 1 (2) | 0 | 0 | 1 (0.7) | (0–2) |
| 4 (highest) | 0 | 0 | 0 | 0 | – |
| Intensity of shivering | |||||
| Median (25th–75th quartile) | 0.5 (0–1) | 0 (0–0) | 0 (0–0) | 0 (0–1) | 0.009a,‡ |
| Mean (±SD) | 0.68 (0.79) | 0.26 (0.53) | 0.04 (0.2) | 32 (0.62) | <0.001b |
| 0.02c |
Notes:
*
Kruskal–Wallis test was used to compare rank of shivering intensity.
‡
Mann–Whitney U-test was used, and P-value corrected by Bonferroni correction for multiple comparison. Analysis of variance test was used to compare quantitative variables among three groups.
a
Placebo group vs pethidine 5 mg group;
b
placebo group vs pethidine 10 mg group;
c
pethidine 5 mg group vs pethidine 10 mg group.
Abbreviations: CI, confidence interval; SD, standard deviation.