Comparison of patient demographics and socioeconomic factors based on operating surgeon volume
| Variable | Surgeon volume | ||
| Lower-volume knee surgeon (n=1003) | Higher-volume knee surgeon (n=549) | P value* | |
| Age (years), mean (SD) | 32.7 (9.4) | 28.5 (9.6) | <0.001 |
| Sex (female), n (%) | 312 (31.1) | 147 (26.8) | 0.074 |
| Race (non-white), n (%) | 121 (12.1) | 90 (16.4) | 0.017 |
| Insurance (non-private), n (%) | 284 (28.3) | 110 (20.0) | <0.001 |
| ADI (percentile) | 0.186 | ||
| <25th percentile, n (%) | 229 (22.8) | 143 (26.1) | |
| 25–75th percentile, n (%) | 485 (48.4) | 270 (49.2) | |
| >75th percentile, n (%) | 268 (26.7) | 127 (23.1) | |
| Missing data, n (%) | 21 (2.1) | 9 (1.6) | |
*χ2 test performed for categorical variables (sex, race, insurance, ADI). Mann-Whitney U test performed for continuous variables (age). Statistical significance at p<0.05 (bold).
ADI, Area Deprivation Index; n, number.