Table 1 Characteristics of ONFH patients and controls
From: An intron SNP rs2069837 in IL-6 is associated with osteonecrosis of the femoral head development
Variables | Cases (N = 566) | Control (N = 566) | p value |
|---|---|---|---|
Age, years | 51.34 ± 14.51 | 51.10 ± 13.93 | 0.503a |
≤ 51 | 307 (54.2%) | 295 (52.1%) | |
> 51 | 259 (45.8%) | 271 (47.9%) | |
Sex | 0.858b | ||
Male | 314 (55.5%) | 311 (55.0%) | |
Female | 252 (44.5%) | 255 (45.0%) | |
Smoking | |||
Yes | 256 (45.2%) | 300 (53.0%) | |
No | 310 (54.8%) | 266 (47.0%) | |
Drinking | |||
Yes | 293 (51.8%) | 285 (50.4%) | |
No | 273 (48.2%) | 281 (49.6%) | |
Stage | |||
III/IV | 223 (39.0%) | ||
I/II | 77 (14.0%) | ||
Missing | 300 (47%) | ||