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Comparison of demographics and pre-operative parameters
| Parameter | Complications group | Control group | P value |
|---|---|---|---|
| Ratio F:M | 54:18 | 61:17 | ns |
| Age | 54 ± 16 | 52 ± 17 | ns |
| Body mass index (BMI) | 25.3 ± 6 | 26.9 ± 7 | ns |
| Number of co-morbidity | 2.5 ± 1.8 | 2.4 ± 1.8 | ns |
| ASA grade | 2.33 ± 0.7 | 2.43 ± 0.5 | ns |
| Percentage of revision cases (%) | 53 | 41 | ns |
| Number of previous surgeries | 1.9 | 1.7 | ns |
