Table 4.

Observed and predicted frequencies for dislocation by logistic regression.^a.

	Observed	Predicted by Logistic Regression		Percentage Correct
		No dislocation	Dislocation
No dislocation	187	169	18	90.4
Dislocation	7	3	4	57.1
Overall % correct				89.2

^aData predicted by Logistic Regression analysis. Logistic Regression predicted 169 “no dislocations” and 18 “dislocations” in the observed group that did not dislocate for an accuracy of 90.4% correctly predicted to not dislocate. Likewise, Logistic Regression predicted three “no dislocations” and four “dislocations” in the observed group that dislocated post-operatively, accurately predicting 57.1% of all dislocations. This Logistic Regression analysis was overall 89.2% accurate in correctly predicting either “no dislocation” or “dislocation” as compared to the observed results.