Table 1 Patients’ characteristics prior to surgery and surgical characteristics by education level
Characteristics | Education level | |||
|---|---|---|---|---|
Low, n=340 | Medium, n=306 | High, n=317 | P value | |
Women (%) | 191 (56.2) | 168 (54.9) | 149 (47.0) | 0.041 |
Age (yrs), mean (SD) | 71.0 (±10.9) | 68 (±12.6) | 64.8 (±11.7) | 0.001 |
Mean age men | 73.3 (±10.2) | 70.1 (±12.8) | 67.1 (±10.3) | <0.001 |
Mean age women | 68.0 (±11.2) | 65.9 (±11.9) | 62.9 (±12.5) | 0.001 |
Age in categories (%) | ||||
<55 | 31 (9.1) | 49 (16.0) | 61 (19.2) | |
55-64 | 62 (18.2) | 67 (21.9) | 74 (23.3) | |
65-74 | 107 (31.5) | 84 (27.5) | 117 (36.9) | |
≥75 | 140 (41.2) | 106 (34.6) | 65 (20.5) | <0.001 |
BMI, mean (SD) | 28.0 (±4.9) | 26.8 (±5.3) | 25.9 (±4.4) | <0.001 |
BMI in categories (%) | ||||
<25 | 103 (30.3) | 115 (37.6) | 145 (45.7) | |
25-29.9 | 126 (37.1) | 116 (37.9) | 125 (39.4) | |
30-34.9 | 78 (22.9) | 56 (18.3) | 36 (11.4) | |
35-39.9 | 27 (7.9) | 15 (4.9) | 10 (3.2) | |
≥40 | 6 (1.8) | 4 (1.3) | 1 (0.3) | 0.001 |
Self-rated health (%)# | ||||
Very bad-bad | 72 (21.2) | 46 (15.0) | 32 (10.1) | |
Good | 216 (63.7) | 177 (57.8) | 161 (50.8) | |
Very good-excellent | 51 (15.0) | 83 (27.1) | 124 (39.1) | <0.001 |
ASA score (%) | ||||
1 | 22 (6.5) | 25 (8.2) | 58 (18.3) | |
2 | 246 (72.4) | 232 (75.8) | 234 (73.8) | |
3-4 | 72 (21.2) | 49 (16.0) | 25 (7.9) | <0.001 |
Diabetes (%) | 52 (15.3) | 36 (11.8) | 20 (6.3) | 0.001 |
HTA (%) | 189 (55.6) | 162 (52.9) | 121 (38.2) | <0.001 |
Cardiac disease (%) | 21 (6.2) | 21 (6.9) | 14 (4.4) | 0.401 |
Charnley classification (%) | ||||
A | 109 (32.1) | 109 (35.6) | 107 (33.8) | |
B | 56 (16.5) | 62 (20.3) | 87 (27.4) | |
C | 175 (51.5) | 134 (43.8) | 123 (38.8) | 0.006 |
Smoking status (%)# | ||||
Never smoker | 204 (60.0) | 184 (60.3) | 188 (59.5) | |
Ever smoker | 136 (40.0) | 121 (39.7) | 128 (40.5) | 0.977 |
Type of osteoarthritis (%) | ||||
Primary osteoarthritis | 304 (89.4) | 276 (90.2) | 271 (85.5) | |
Secondary osteoarthritis | 36 (10.6) | 30 (9.8) | 46 (14.5) | 0.141 |
Any medication use (%) | 188 (55.3) | 169 (55.2) | 176 (55.5) | 0.997 |
Type of pain medication use (%) | ||||
Acetaminophen | 73 (21.5) | 75 (24.5) | 66 (20.8) | 0.497 |
NSAIDs | 119 (35.0) | 122 (39.9) | 143 (45.1) | 0.030 |
Opioids | 59 (17.4) | 40 (13.1) | 43 (13.6) | 0.238 |
Type of insurance (%) | ||||
Private | 8 (2.4) | 25 (8.2) | 97 (30.6) | |
Public | 332 (97.6) | 281 (91.8) | 220 (69.4) | <0.001 |
Surgical approach (%) | ||||
Anterior | 302 (87.6) | 268 (87.6) | 275 (86.8) | |
Lateral | 15 (4.4) | 11 (3.6) | 19 (6.0) | |
Other | 23 (6.8) | 27 (8.8) | 23 (7.3) | 0.551 |
Implant fixation (%) | ||||
Uncemented | 248 (72.9) | 231 (75.5) | 256 (80.8) | |
Hybrid | 85 (250) | 68 (22.2) | 58 (6.0) | |
Cemented | 7 (2.1) | 7 (2.3) | 3 (0.9) | 0.160 |
Bearing surface (%) | ||||
Ceramic-on-highly cross-linked polyethylene | 326 (95.9) | 284 (92.8) | 295 (93.1) | |
Other | 14 (4.1) | 22 (7.2) | 22 (6.9) | 0.184 |