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Table 1 Patient demographics between the two groups

From: The diagnostic value of SPECT/CT in predicting the occurrence of osteonecrosis following femoral neck fracture: a prospective cohort study

Variables (mean, 95% CI) Total (N = 30) ONFH (N = 6) Non-ONFH (N = 24) p-value
Age (years) 64.3 (57.3–71.3) 44.2 (28.3–60.1) 69.3 (62.7–75.9) 0.009
Female (%) 63.3% (n = 19) 66.7% (n = 4) 62.5% (n = 15) 0.900
BMI (kg/m2) 21.8 (20.6–23.0) 22.8 (20.4–25.2) 21.5 (20.1–23.0) 0.273
BMD (g/cm2) 0.7 (0.7–0.8) 0.9 (0.7–1.0) 0.7 (0.6–0.8) 0.093
Displaced fracture (%) 30% (n = 9) 100% (n = 6) 12% (n = 3) <  0.001
Duration of follow-up (years) 2.4 (2.2–2.5) 2.1 (2.0–2.2) 2.4 (2.3–2.6) 0.082
  1. BMI body mass index; BMD bone marrow density, CI confidence interval, ONFH osteonecrosis of the femur head