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Table 4 Results for the Bice-Boxerman Concentration of Care Index at the physician 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 – Physician-level
 Mean (s.d.) 0.56 (0.43) 0.45 (0.42) 0.72 (0.37) 0.64 (0.41)
 99% CI 0.55–0.56 0.44–0.45 0.71–0.72 0.63–0.64
 Proportion (%) of patients with totally concentrated primary care (COCI = 1) 44 32 59 51
 Proportion (%) of patients with totally dispersed primary care (COCI = 0.00) 24 31 10 17
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.) 0.74 1.46 1.18
 99% CI   0.71–0.76 1.38–1.53 1.13–1.23
p-value   < 0.001 < 0.001 < 0.001
Adjusted regressionc
 Exp (β) 1.00 (ref.) 0.76 1.53 1.22
 99% CI   0.74–0.79 1.47–1.60 1.16–1.28
p-value   < 0.001 < 0.001 < 0.001
  1. aNumber of patients with valid data in the 12-month 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