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Table 5 Results for the Bice-Boxerman Concentration of Care Index at the practice level by time period: descriptive statistics and GEE repeated measures model estimates, unadjusted and adjusted for potentially predisposing, need and enabling covariates

From: Improved access to and continuity of primary care after attachment to a family physician: longitudinal cohort study on centralized waiting lists for unattached patients in Quebec, Canada

  Pre-attachment Post-attachment
T0–2 years T0–1 year T0 + 1 year T0 + 2 years
Number of patients with at least 2 primary care visitsa 155,086 156,760 299,594 155,729
Concentration of care index – Practice-level
 Mean (s.d.) 0.78 (0.34) 0.72 (0.37) 0.84 (0.30) 0.82 (0.32)
 99% CI 0.78–0.79 0.71–0.72 0.83–0.84 0.81–0.82
 Proportion (%) of patients with totally concentrated primary care (COCI = 1) 67 59 73 72
 Proportion (%) of patients with totally dispersed primary care (COCI = 0.00) 9 12 5 7
Number of primary care visitsb
 Mean (s.d.) 2.06 (2.82) 2.05 (2.74) 3.92 (3.12) 2.53 (2.80)
 99% CI 2.05–2.07 2.04–2.06 3.90–3.93 2.52–2.54
Unadjusted regression
 Exp (β) 1.00 (ref.) 0.78 1.17 1.12
 99% CI   0.75–0.81 1.11–1.22 1.06–1.18
p-value   < 0.001 < 0.001 < 0.001
Adjusted regressionc
 Exp (β) 1.00 (ref.) 0.80 1.19 1.15
 99% CI   0.77–0.83 1.14–1.25 1.09–1.22
p-value   < 0.001 < 0.001 < 0.001
  1. aNumber of patients with valid data in the 12-mont time period
  2. bNumber of primary care visits is not included in this analysis, but ≥2 visits were required for a valid index. Number of visits is provided to indicate primary care utilization per time period
  3. cAdjusted for age, sex, Charlson Comorbidity Index, medical vulnerability and region remoteness