Presurgery characteristics and osteoarthritis severity of 2 cohorts of patients who underwent total knee replacement
| Variable | No. (%) of patients* | |
|---|---|---|
| Cohort 1 (earlier) n = 494 | Cohort 2 (later) n = 251 | |
| Age, yr | ||
| Mean ± SD (95% CI) | 64.9 ± 10.2 (64.0–65.8) | 65.1 ± 9.2 (63.9–66.2) |
| Range | 35–87 | 43–90 |
| Male sex; 95% CI | 171 (34.6); 30.6–38.9 | 112 (44.6); 38.6–50.1 |
| Education; 95% CI | ||
| High school or greater | 326 (66.0); 62.2–70.6 | 180 (71.7); 66.4–77.5 |
| Missing | 4 (0.8) | 2 (0.8) |
| Marital status; 95% CI† | ||
| Single | 176 (35.6); 32.5–41.1 | 63 (25.1); 20.3–31.0 |
| Missing | 14 (2.8) | 2 (0.8) |
| Living status; 95% CI | ||
| Lives alone | 121 (24.5); 20.9–28.5 | 49 (19.5); 15.7–25.8 |
| Missing | 0 (0) | 9 (3.6) |
| Body mass index; 95% CI | ||
| Underweight | 2 (0.4); 0.1–1.5 | 1 (0.4); 0.1–2.3 |
| Normal | 83 (16.8); 13.8–20.4 | 49 (19.5); 15.5–25.5 |
| Overweight | 184 (37.2); 33.2–41.8 | 76 (30.3); 25.7–37.2 |
| Obese | 223 (45.1); 40.9–49.6 | 118 (47.0); 24.2–54.6 |
| Missing | 2 (0.4) | 7 (2.8) |
| ≥ 1 comorbid condition; 95% CI | 394 (79.8); 76.0–83.1 | 201 (80.1); 74.2–84.5 |
| Hypertension; 95% CI | 242 (49.0); 44.6–53.4 | 121 (48.2); 42.1–54.4 |
| Cardiovascular disease; 95% CI | 31 (6.3); 4.5–8.8 | 21 (8.4); 5.5–12.5 |
| Diabetes; 95% CI | 71 (14.4); 11.5–17.4 | 37 (14.7); 10.9–19.7 |
| WOMAC pain‡ | ||
| Mean score ± SD (95% CI) | 47.8 ± 17.8 (46.2–49.4) | 49.3 ± 20.0 (46.8–51.8) |
| Range | 0–100 | 0–100 |
| Missing | 11 (2.2) | 3 (1.2) |
| WOMAC physical function‡ | ||
| Mean score ± SD (95% CI) | 50.3 ± 18.5 (48.6–51.9) | 50.3 ± 19.4 (47.9–52.7) |
| Range | 0–96 | 0–99 |
| Missing | 8 (1.6) | 5 (2.0) |
| LLFDI-D limitation†‡ | ||
| Mean score ± SD (95% CI) | 59.2 ± 11.0 (58.2–60.2) | 62.3 ± 12.9 (60.7–63.9) |
| Range | 23–100 | 19–100 |
| Missing | 47 (9.5) | 5 (2.0) |
Note: CI = confidence interval, LLFDI-D = Late-Life Function and Disability Instrument disability component, SD = standard deviation, WOMAC = Western Ontario and McMaster Universities Osteoarthritis Index.
↵* Except where noted otherwise.
↵† 95% CIs do not overlap.
↵‡ Scored 0–100, with higher scores indicating less pain and better function.