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The incidence rate of adverse effect.
| Adverse effect | Studies | Total number of adverse effects | |
|
|
|||
| Experiment group | Control group | ||
| Nausea | (15, 16) | 4 | 5 |
| Hypotension | (15, 16, 21) | 6 | 3 |
| Vomiting | (15, 16) | 4 | 4 |
| Headache | (15, 16, 21) | 3 | 1 |
| Slow heart rate | (21) | 2 | 2 |
| No detailed classification | (20) | 4 | 4 |
| No adverse effect | (14) | 0 | 0 |
| Total events | 23/194 | 19/194 | |
| Incident rate | 11.9% | 9.8% | |
