Table 3. Estimation of Relative Risk and Confidence Interval 95% in Variables: Shivering, Nausea, Vomiting, Hypotension, Pruritus and Apgar Score.
| Parameters | Sample Size | Number of Study | I2, % | RR (95% CI) | P |
|---|---|---|---|---|---|
| Shivering (dose ≤ 20) | 720 | 12 | 61.6 | 0.34 (0.23, 0.48) | 0.003 |
| Shivering (dose > 20) | 440 | 8 | 62.9 | 0.18 (0.09, 0.39) | 0.009 |
| Nausea (dose ≤ 20) | 690 | 12 | 10.2 | 1.37 (1.13, 1.66) | 0.345 |
| Nausea (dose > 20) | 520 | 9 | 69.8 | 1.33 (0.88, 2.02) | 0.001 |
| Vomiting (dose ≤ 20) | 670 | 12 | 60.5 | 2.02 (1.28, 3.20) | 0.003 |
| Vomiting (dose > 20) | 520 | 9 | 72.8 | 1.57 (0.78, 3.17) | 0.000 |
| Hypotension (dose ≤ 20) | 450 | 7 | 0.00 | 1.00 (0.87, 1.15) | 0.473 |
| Hypotension (dose > 20) | 517 | 8 | 62.8 | 1.01 (0.72, 1.43) | 0.009 |
| Pruritus (dose ≤ 20) | 760 | 12 | 0.00 | 9.26 (4.17, 20.58) | 0.999 |
| Pruritus (dose > 20) | 490 | 8 | 0.00 | 17.77 (7.34, 43.00) | 0.986 |
| Apgar > 7 at 1 min (dose ≤ 20) | 370 | 6 | 0.00 | 0.99(0.9, 1.09) | 0.996 |
| Apgar > 7 at 1 min (dose > 20) | 568 | 9 | 0.00 | 0.96 (0.92, 1.02) | 1.000 |
| Apgar > 7 at 5 min (dose ≤ 20) | 340 | 6 | 0.00 | 0.93 (0.87, 1.08) | 0.687 |
| Apgar > 7 at 5 min (dose > 20) | 570 | 6 | 0.00 | 0.99 (0.95, 1.02) | 0.889 |
Abbreviations: CI, confidence interval; I2, I-squared; RR, relative risk (random effects models and fixed effects models).