Table II.
Audit cohort patient demographics.
| Variable | First side | Second side | p-value* |
|---|---|---|---|
| Age, yrs, median (IQR) | 67 (60 to 71) | 68 (61 to 72) | < 0.001 |
| ASA grade, n | |||
| 1 | 16 | 12 | 0.225 |
| 2 | 198 | 191 | |
| 3 | 21 | 33 | |
| 4 | 1 | 0 | |
| Median (IQR) | 2 (2 to 2) | 2 (2 to 2) | 0.080† |
| Female THA, n (%) | 73 (59.8) | N/A | N/A |
| Female TKA, n (%) | 83 (72.8) | N/A | |
| BMI, kg/m2, median (IQR) | 30.4 (27.0 to 27.9) | 31.3 (27.9 to 35.8) | < 0.001 |
| Length of hospital stay, days, median (IQR) | 3 (3 to 5) | 3 (2 to 4) | < 0.001 |
| THA, median (IQR) | 3 (2 to 5) | 3 (2 to 4) | < 0.001 |
| TKA, median (IQR) | 4 (3 to 5) | 3 (3 to 4) | 0.006 |
| TKA | |||
| Female ASA grade 1, n (%) | 5 (6.0) | 1 (1.2) | 0.106 |
| Grade 2, n (%) | 71 (85.5) | 69 (83.1) | |
| Grade 3, n (%) | 7 (8.4) | 13 (15.7) | |
| Female BMI, kg/m2, median (IQR) | 31.7 (28.4 to 37.9) | 33.1 (29.3 to 38.7) | 0.616 |
| Female KL grade, median (IQR) | 3.0 (3.0 to 4.0) | 3.0 (3.0 to 4.0) | 0.493 |
| Female length of stay, days, median (IQR) | 4.0 (3.0 to 5.0) | 3.0 (3.0 to 4.0) | 0.194 |
| Male ASA grade 1, n (%) | 1 (3.2) | 1 (3.2) | 1.000 |
| Grade 2, n (%) | 25 (80.6) | 25 (80.6) | |
| Grade 3, n (%) | 5 (16.1) | 5 (16.1) | |
| Male BMI kg/m2, median (IQR) | 32.8 (29.4 to 37.6) | 33.1 (28.1 to 37.0) | 0.730 |
| Male KL grade, median (IQR) | 3.0 (3.0 to 3.0) | 3.0 (3.0 to 3.0) | 1.000 |
| Male length of hospital stay, days, median (IQR) | 4.0 (3.0 to 6.0) | 3.0 (2.0 to 4.0) | 0.151 |
| THA | |||
| Female ASA grade 1, n (%) | 5 (6.8) | 6 (8.2) | 0.522 |
| Grade 2, n (%) | 52 (84.9) | 57 (78.1) | |
| Grade 3, n (%) | 6 (8.2%) | 10 (13.7%) | |
| Female BMI, kg/m2, median (IQR) | 27.7 (24.2 to 30.7) | 29.3 (26.6 to 33.4) | 0.039 |
| Female OA grade, median (IQR) | 3.0 (2.0 to 3.0) | 2.0 (2.0 to 3.0) | 0.052 |
| Female length of hospital stay, days, median (IQR) | 3.0 (3.0 to 5.0) | 3.0 (2.0 to 4.0) | 0.046 |
| Male ASA grade 1, n (%) | 5 (10.2) | 4 (8.2) | 0.657 |
| Grade 2, n (%) | 40 (81.6) | 40 (81.6) | |
| Grade 3, n (%) | 3 (6.1) | 5 (10.2) | |
| Grade 4, n (%) | 1 (2.) | 0 (0.0) | |
| Male BMI, kg/m2, median (IQR) | 29.6 (27.7 to 33.5) | 30.5 (28.1 to 33.5 | 0.407 |
| Male OA grade, median (IQR) | 2.0 (2.0 to 2.0) | 2.0 (2.0 to 2.0) | 0.786 |
| Male length of stay, days, median (IQR) | 3.0 (2.0 to 4.0 | 3.0 (2.0 to 3.5) | 0.215 |
*
Categorical data anlysed using chi squared analysis. All other data analyzed using Mann-Whitney U test.
†
Related samples Wilcoxon rank test.
ASA, American Society of Anaesthesiologists; IQR, interquartile range; KL, Kellgren and Lawrence; N/A, not applicable; OA, osteoarthritis; THA, total hip arthroplasty; TKA, total knee arthroplasty.