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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%)   
  1. ap values were calculated from independent sample t-test
  2. bp values were calculated from two-sided χ2 test