Table 5.

Cox Proportional Hazards Regression Model of Suicide Risk Without (Model 1) and With (Model 2) Inclusion of Natural Language Processing of Narrative Discharge Summary

Variable	Adjusted Hazard Ratio (95% CI)a
	Model 1	Model 2
Male sex	2.80 (2.11–3.71)	2.57 (1.94–3.41)
White race	2.27 (1.56–3.30)	2.23 (1.53–3.24)
Age at admission, y	0.80 (0.65–0.97)	0.79 (0.65–0.96)
Age-adjusted Charlson Comorbidity Index	0.95 (0.74–1.21)	0.89 (0.69–1.15)
Primary psychiatric diagnosis at admission	1.63 (0.93–2.85)	1.39 (0.79–2.45)
Psychiatric visits in 12 mo before admission	1.18 (1.07–1.31)	1.17 (1.06–1.30)
Prior psychiatric visits (ever)	1.15 (1.01–1.31)	1.14 (1.01–1.30)
Outpatient visits (any) in 12 mo before admission	0.79 (0.67–0.94)	0.84 (0.71–1.00)
Emergency department visits in 12 mo before admission	2.37 (1.83–3.06)	2.19 (1.68–2.84)
Positive valence	NA	0.70 (0.58–0.85)
Negative valence	NA	1.15 (0.99–1.32)

Abbreviation: NA, not applicable.

^aAdjusted for all other terms in the model.