Table 2

Effect of Continuity of Care and Morbidity Burden on Adjusted Hazard Ratios of Inpatient Admissions

Predictive VariableSubcohorta
Primary Care, HRb (95% CI) (n = 8,863)Specialty Care, HRb (95% CI) (n = 6,724)Primary and Specialty Care, HRb (95% CI) (n = 5,660)
Primary care continuity (COCI)0.97 (0.96–0.99)c0.99 (0.97–1.01)
Specialty care continuity (COCI)0.95 (0.93–0.98)c0.94 (0.92–0.97)c
Morbidity burdend1.12 (1.10–1.14)c1.09 (1.06–1.11)c1.09 (1.06–1.12)c
  • COCI = Continuity of Care Index27; HR = hazard ratio.

  • a Three or more visits of any type required for subcohort membership.

  • b Adjusted for age, sex, race/ethnicity, socioeconomic status, and prior year primary care, specialty care, and baseline inpatient admissions. HR is for each 0.1-unit increase in COCI.

  • c Significant at P ≤.05.

  • d According to the Quan-adapted Elixhauser comorbidity index.28 HR is for 1-unit increase in morbidity score.