TABLE III.

Predictors of Handrail Use at Two Years^*

		Percentage Correctly Predicted			Odds Ratio (Nagelkerke R2 Value)	Significance of Model (P Value)	Significance of Model if Variable Removed (P Value)
Model	Variables in Model	Handrail	No Handrail	Overall
Step 1	Preoperative handrail use	58%	76%	68%	0.152	<0.001	Preoperative handrail use, <0.001
Step 2	Preoperative handrail use, age	58%	81%	71%	0.263	<0.001	Preoperative handrail use, 0.001; age, 0.002
Step 3	Preoperative handrail use, age, quadriceps index	58%	86%	74%	0.316	<0.001	Preoperative handrail use, 0.001; age, 0.001; quadriceps index, 0.024

^*The best predictor of handrail use at two years was preoperative handrail use (Step 1). The addition of age and quadriceps index significantly improved the predictive ability of the model.