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Table 2 Summary of the full and reduced multivariable logistic regression model.

From: Risk factor analysis for early femoral failure in metal-on-metal hip resurfacing arthroplasty: the effect of bone density and body mass index

Variables Degree of Freedom Type* P value
Full model including all of the following variables (P = 0.04)
Femoral fixation type 1 C 0.7
Femoral Component Size 1 N 0.5
Primary DX 1 C 0.95
Sex 1 C 0.27
Age 1 N 0.67
T-score 2** C 0.002
BMI 1 N 0.02
Reduced model only including significant variables (P = 0.002)
T-score 2** C 0.002
BMI 1 N 0.02
  1. * C = Category; N = Numerical
  2. ** Grouped with T≥0, 0 > T > -1.5, and T≤ -1.5