Table I.
Comparison of demographics and outcomes between included and excluded patients.
| Variable | Audit group (n = 236) | Excluded patients (n = 933) | p-value* |
|---|---|---|---|
| Sex, n (%) | |||
| Female | 156 (66.1) | 558 (59.8) | 0.076 |
| Male | 80 (33.9) | 375 (40.2) | |
| ASA grade, n (%) | |||
| 1 | 16 (6.8) | 74 (7.9) | 0.057 |
| 2 | 198 (83.9) | 737 (79.0) | |
| 3 | 21 (8.9) | 122 (13.1) | |
| 4 | 1 (0.4) | 0 (0.0) | |
| Interval between procedures, mnths, median (IQR) | 13.7 (9.5 to 21.3) | 11.2 (6.1 to 21.6) | 0.002 |
| Age, yrs, median (IQR) | 67 (60 to 71) | 67 (59 to 73) | 0.455 |
| BMI kg/m2, median (IQR) | 30.4 (27 to 34.7) | 30.7 (27.5 to 34) | 0.627 |
| Length of hospital stay, days, median (IQR) | 3 (3 to 5) | 4 (3 to 5) | 0.002 |
| Preoperative pain, median (IQR) | 5 (4 to 5) | 5 (4 to 5) | 0.188 |
| Preoperative Oxford score, median (IQR) | 12 (8.2 to 17) | 11 (8 to15) | 0.060 |
| One-year postoperative pain, median (IQR) | 2 (1 to 3) | 2 (1 to 3) | 0.563 |
| One-year postoperative Oxford score (range) | 38 (30 to 43) | 38 (29 to 44) | 0.500 |
*
Categorical data anlysed using chi squared test. All other data analyzed using Mann-Whitney U test.
ASA, American Society of Anaesthesiologists; ; IQR, interquartile range.