Table 1.
Preoperative demographics and comorbidities stratified by acute length of stay in hospital
| Variables | Group, no. (%) or median [IQR] | |||
|---|---|---|---|---|
| All cases (n = 1459) | ≤ 3 d (n = 512) | 4 d (n = 431) | ≥ 5 d (n = 516) | |
| Joint replacement | ||||
| Total hip replacement | 559 (38.3) | 146 (28.5) | 174 (40.4) | 239 (46.3) |
| Total knee replacement | 900 (61.7) | 366 (71.5) | 257 (59.6) | 277 (53.7) |
| Sex | ||||
| Male | 618 (42.4) | 262 (51.2) | 151 (35) | 205 (39.7) |
| Female | 841 (57.6) | 250 (48.8) | 280 (65) | 311 (60.3) |
| Age, yr | 67 [52–82] | 63 [50–76] | 67 [53–81] | 73 [59–87] |
| Male | 66 [50–81] | 62 [49–75] | 66 [51–81] | 73 [61–85] |
| Female | 68 [53–83] | 64 [50–78] | 68 [54–82] | 73 [58–88] |
| Age ≥ 75 yr | 390 (26.7) | 65 (12.7) | 98 (22.7) | 227 (44) |
| BMI | 30.4 [22.4–38.4] | 30.7 [22.3–39.1] | 30.7 [22.6–38.8] | 30 [22–38] |
| Male | 30.1 [23.6–36.6] | 30.3 [23.7–36.9] | 30.2 [23.4–37] | 29.8 [23.4–36.2] |
| Female | 30.8 [21.2–40.4] | 31.6 [21.1–42.1] | 31 [21.8–40.2] | 30.1 [20.6–39.6] |
| BMI class | ||||
| Underweight (< 18.5) | 9 (0.6) | 6 (1.2) | 2 (0.5) | 1 (0.2) |
| Normal (18.5–24.9) | 191 (13.1) | 63 (12.3) | 46 (10.7) | 82 (15.9) |
| Overweight (25.0–29.9) | 481 (33.0) | 158 (30.9) | 146 (33.9) | 177 (34.3) |
| Obese ( ≥ 30.0) | 778 (53.3) | 285 (55.7) | 237 (55.0) | 256 (49.6) |
| Obesity class | ||||
| I (BMI 30.0–34.9) | 417 (28.6) | 150 (29.3) | 126 (29.2) | 417 (28.6) |
| II (BMI 35.0–39.9) | 205 (14.1) | 79 (15.4) | 56 (13.0) | 70 (13.6) |
| III (BMI ≥ 40.0) | 156 (10.7) | 56 (10.9) | 55 (12.8) | 45 (8.7) |
| Primary TJR diagnosis | ||||
| Osteoarthritis | 1418 (97.2) | 500 (97.7) | 414 (96.1) | 504 (97.7) |
| Rheumatoid arthritis | 37 (2.5) | 10 (2.0) | 15 (3.5) | 12 (2.3) |
| Avascular necrosis | 4 (0.3) | 2 (0.4) | 2 (0.5) | 0 (0) |
| ASA classification | ||||
| 1 | 11 (0.8) | 7 (1.4) | 4 (0.9) | 0 (0) |
| 2 | 344 (23.6) | 163 (31.8) | 103 (23.9) | 78 (15.1) |
| 3 | 905 (62) | 303 (59.2) | 276 (64.0) | 326 (63.2) |
| 4 | 199 (13.6) | 39 (7.6) | 48 (11.1) | 112 (21.7) |
| Total no. comorbidities | 3 [0–6] | 3 [0–6] | 3 [0–6] | 3 [0–6] |
| No. patients with comorbidities | ||||
| Cardiovascular diagnosis | 971 (66.6) | 291 (56.8) | 292 (67.7) | 388 (75.2) |
| Respiratory diagnosis | 472 (32.4) | 183 (35.7) | 126 (29.2) | 163 (31.6) |
| Endocrine diagnosis | 431 (29.5) | 125 (24.4) | 136 (31.6) | 170 (32.9) |
| Neurologic diagnosis | 109 (7.5) | 19 (3.7) | 39 (9.0) | 51 (9.9) |
| Renal diagnosis | 44 (3.0) | 4 (0.8) | 8 (1.9) | 32 (6.2) |
| Gastrointestinal diagnosis | 472 (32.4) | 152 (29.7) | 155 (36.0) | 165 (32.0) |
| Hematologic diagnosis | 93 (6.4) | 21 (4.1) | 25 (5.8) | 47 (9.1) |
| Other MSK diagnosis | 213 (14.6) | 67 (13.1) | 59 (13.7) | 87 (16.9) |
| Psychiatric/substance abuse | 312 (21.4) | 130 (25.4) | 81 (18.8) | 101 (19.5) |
| Other — HIV or hepatitis | 9 (0.6) | 5 (1.0) | 1 (0.2) | 3 (0.6) |
ASA = American Society of Anesthesiologists; BMI = body mass index; HIV = human immunodeficiency virus; IQR = interquartile range; MSK = musculoskeletal; TJR = total joint replacement.