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Anesthesia and duration of surgery, n (%)
| Experiment | Control | χ2 | P value | |
| Anesthesia | ||||
| Inhalation | 73 (97.3) | 74 (98.7) | 0.34 | 0.56 |
| Intravenous injection | 2 (2.7) | 1 (1.3) | ||
| Surgical procedure | ||||
| Tonsillectomy and adenoidectomy | 71 (94.7) | 72 (96) | 0.34 | 0.56 |
| Tonsillectomy | 4 (5.3) | 3 (4) | ||
| Surgery duration (min) | ||||
| 20-30 | 48 (64) | 55 (73.3) | ||
| 30-40 | 24 (32) | 19 (25.3) | ||
| 40-50 | 2 (2.7) | 0 (0) | ||
| 50-60 | 1 (1.3) | 0 (0) | ||
