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Distribution of the number of blood packs used in the surgery by the sex of the patient and the type of scoliosis treated.
| Mean | Median | Min-max | 95% CI | |
| Male | 0.69 | 0.00 | 0-4 | 0.56 (0.22-1.16) |
| Female | 1.34 | 1.00 | 0-5 | 1.25 (0.98-1.71) |
| Congenital scoliosis | 0.54 | 0.00 | 0-3 | 0.43 (0.01-1.07) |
| Neuromuscular scoliosis | 1.10 | 0.00 | 0-5 | 0.04 (0.37-1.83) |
| Idiopathic scoliosis | 1.32 | 1.0 | 0-4 | 1.24 (0.93-1.70) |
CI = confidence interval
