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Table 2 Univariate odds ratios of different characteristics for the necrotic femoral head

From: Insufficient blood supply of fovea capitis femoris, a risk factor of femoral head osteonecrosis

Characteristic Univariate OR (95% CI) P value
Number of nutrient foramina 0.51 (0.40–0.66) < 0.001
Area
 Total area of nutrient foramina, mm2 0.58 (0.44–0.77) < 0.001
 Mean area of nutrient foramina, mm2 0.52 (0.30–0.92) 0.023
Diameter
 Maximum diameter of the nutrient foramen, mm 0.26 (0.15–0.45) < 0.001
 Minimum diameter of the nutrient foramen, mm 0.20 (0.10–0.42) < 0.001
  1. Significant values are shown in bold
  2. Abbreviations: OR, odds ratio