Table 5:

Cox regression analyses with grouped depression variable

Variable	Hospital admissions, HR (95% CI)		Inpatient death, HR (95% CI)
	Univariate	Multivariate	Univariate	Multivariate
Depression*†
GDS-15 score = 1–4	2.06 (1.83–2.31)	1.70 (1.50–1.92)	3.72 (2.0–6.89)	2.45 (1.26–4.75)
GDS-15 score = 5–9	2.98 (2.45–3.61)	2.08 (1.68–2.58)	6.11 (2.53–14.8)	3.05 (1.15–8.13)
GDS-15 score = 10–15	4.66 (3.23–6.72)	3.06 (2.10–4.46)	11.00 (2.54–47.7)	4.38 (0.89–21.4)
Age		1.29 (1.21–1.38)		2.28 (1.67–3.12)
Education level		0.93 (0.87–0.98)		1.17 (0.88–1.54)
Duke Social Support Index tertiles		1.03 (0.96–1.10)		0.93 (0.65–1.33)
Smoking		0.78 (0.69–0.89)		0.60 (0.30–1.22)
Charlson index (weighted)		1.15 (1.13–1.18)		1.16 (1.05–1.29)

Note: CI = confidence interval, GDS-15 = 15-item Geriatric Depression Scale, HR = hazard ratio.

^*No clinically significant depression = GDS-15 score < 7; clinically significant depression = GDS-15 score ≥ 7.

^†Reference GDS-15 score = 0.