Table 2. Significant hazard ratios for readmission in Cox regression analysis.

Cost violates the proportional hazards assumption. Functional status was measured using the Barthel Index, cognitive status using the Cognitive Performance Scale.

Characteristics	Hazard ratio (95% CI)
Functional status
Low vs. high	4.78 (3.22–7.10)
Moderate vs. high	2.79 (1.87–4.15)
Number of physician visits (>1 vs. 0)	1.82 (1.50–2.21)
Intravenous medications	1.63 (1.39–1.92)
Ownership (for-profit vs. non-profit)	1.43 (1.21–1.69)
Index hospital length of stay (log-transformed)	1.41 (1.28–1.56)
Heart failure primary diagnosis	1.40 (1.06–1.84)
Size of facility (>100 beds vs. 100 beds or less)	1.35 (1.19–1.53)
Previous admissions in last 6 months (per admission)	1.25 (1.16–1.35)
Index hospitalization length of stay (log-transformed)	1.21 (1.10–1.34)
Cognitive performance
Low vs. high	0.80 (0.67–0.96)
Moderate vs. high	0.96 (0.74–1.25)
Dual-eligible (Medicare+Medicaid vs Medicare-only)	0.80 (0.68–0.94)
Cost of PAC stay	0.68 (0.65–0.71)