Table 1.
Baseline (preoperative) characteristics of patients in Ontario who underwent primary total hip arthroplasty in 2002 to 2007 by BMI category
| Characteristic | No. (%) of patients | p value | ||
|---|---|---|---|---|
| BMI > 45 n = 726 |
BMI ≤ 45 n = 21 525 |
Total n = 22 251 |
||
| Sex | ||||
| Female | 464 (63.9) | 11 297 (52.5) | 11 761 (52.9) | < 0.001 |
| Male | 262 (36.1) | 10 228 (47.5) | 10 490 (47.1) | |
| Age, yr | ||||
| Mean ± SD | 60.62 ± 7.74 | 63.43 ± 7.87 | 63.34 ± 7.88 | < 0.001 |
| 45–54 | 174 (24.0) | 3491 (16.2) | 3665 (16.5) | < 0.001 |
| 55–64 | 303 (41.7) | 6926 (32.2) | 7229 (32.5) | |
| 65–74 | 249 (34.3) | 11 108 (51.6) | 11 357 (51.0) | |
| SES, percentile | ||||
| 0–20 | 146 (20.1) | 3318 (15.4) | 3464 (15.6) | 0.002 |
| 21–40 | 135 (18.6) | 3998 (18.6) | 4133 (18.6) | |
| 41–60 | 132 (18.2) | 4244 (19.7) | 4376 (19.7) | |
| 61–80 | 154 (21.2) | 4571 (21.2) | 4725 (21.2) | |
| 81–100 | 154 (21.2) | 5335 (24.8) | 5489 (24.7) | |
| Missing | < 6 | 59 (0.3) | 64 (0.3) | |
| Sum of all ADGs, mean ± SD | 6.36 ± 2.94 | 6.31 ± 2.81 | 6.31 ± 2.82 | 0.67 |
| Sum of major ADGs, mean ± SD | 1.23 ± 1.08 | 1.24 ± 1.13 | 1.24 ± 1.12 | 0.79 |
ADGs = Johns Hopkins Aggregated Diagnosis Groups; BMI = body mass index, measured in kg/m2; SD= standard deviation; SES = socioeconomic status.