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Table 2 Multivariate analysis of factors affecting the occurrence of ONHF

From: Osteonecrosis of femoral head in young patients with femoral neck fracture: a retrospective study of 250 patients followed for average of 7.5 years

Index ß SE Wald P OR 95%CI
Removal of internal fixation 0.372 0.175 4.871 0.028 1.647 1.105~2.547
Type of fracture (displacement fracture) 0.325 0.135 6.254 0.012 1.398 1.071~1.996
Quality of reduction (dissatisfied) 0.492 0.243 3.968 0.031 1.625 1.008~2.658
BMI (≥ 25) 1.368 0.389 11.327 0.019 4.658 3.658~8.954
ASAS classification (III + IV) 0.462 0.201 2.354 0.037 1.697 1.065~2.634