Table 3

Effect of Continuity of Care and Morbidity Burden on Adjusted Hazard Ratios of Emergency Department Visits

Predictive VariablesSubcohorta
Primary Care, HR (95% CI)b (n = 8,706)Specialty Care, HR (95% CI)b (n = 6,738)Primary and Specialty Care, HR (95% CI)b (n = 5,713)
Primary care continuity (COCI)0.97 (0.96–0.98)c0.98 (0.96–1.00)c
Specialty care continuity (COCI)0.98 (0.96–1.00)c0.98 (0.95–1.00)
Morbidity burdend1.06 (1.04–1.08)c1.05 (1.03–1.07)c1.06 (1.03–1.08)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 emergency department visits. 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.