Table 2.

Preoperative Predictors of Delirium in Final Model

Effect	Label	Wald Chi-square			Maximum Likelihood
		df	χ2	P	Estimate	Standard Error	Odds Ratio (95% CI)
Gender	Female vs. Male	1	9.51	.002	0.59	0.19	1.81 (1.24–2.63)
Preoperative TICS score	<30 vs. ≥ 35	2	19.32	<.0001	1.18	0.27	3.25 (1.90–5.54)
	30–35 vs. ≥ 35				0.71	0.23	2.03 (1.30–3.18)
History of central nervous system disorder	Yes vs. No	1	4.03	.045	0.38	0.19	1.47 (1.01–2.13)
Surgical risk	III vs. I–II	1	8.42	.004	0.67	0.23	1.96 (1.24–3.08)
Surgery type	Orthopedic/Neurological vs. Other	1	8.99	.003	0.59	0.20	1.81 (1.23–2.66)

TICS = telephone interview of cognitive status. N = 541.

Logistic regression was performed. The goodness of fit test of the final model was satisfied (P = .838) and C statistic of the prediction model is .687 (95% CI = .642–.733). Area under the curve by 10-fold cross-validation is .650.