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Table 4 Comparison of ICC estimates for process-of-care indicators between single versus multiple physician practices

From: Intracluster correlation coefficients for sample size calculations related to cardiovascular disease prevention and management in primary care practices

Quality of Care Indicator* ICC ICC Ratio (Single/Multiple)
Single Physician Multiple Physicians
N = 50 N = 34
All patients
One blood pressure reading 0.064 0.021 3.06
Two blood pressure readings 0.154 0.029 5.24
Lipid profile 0.109 0.011 10.14
Fasting blood glucose 0.043 0.017 2.56
eGFR 0.066 0.041 1.61
ACR 0.146 0.054 2.70
Smoking status checked 0.080 0.094 0.85
Waist circumference 0.237 0.091 2.59
Patients with Hypertension
One blood pressure reading 0.059 0.015 3.87
Two blood pressure readings 0.160 0.024 6.64
Anti-hypertensive medication 0.019 0.011 1.63
Patients with Dyslipidemia
Lipid profile 0.069 0.009 8.08
Lipid lowering medication 0.016 0.016 1.04
Patients with Diabetes
HbA1c 0.093 0.037 2.51
glycemic medication 0.046 0.028 1.66
1 blood pressure reading 0.080 0.009 8.89
2 blood pressure readings 0.192 0.017 11.42
Lipid Profile 0.109 0.032 3.40
Fasting blood glucose 0.082 0.034 2.40
eGFR 0.080 0.059 1.35
ACR 0.172 0.124 1.38
Patients with Chronic Kidney Disease
eGFR 0.039 0.057 0.69
ACR 0.178 0.033 5.35
1 blood pressure reading 0.089 0.018 5.01
2 blood pressure readings 0.221 0.035 6.37
Patients with Coronary Artery Disease
CAD Medication 0.026 0.009 2.95
1 blood pressure reading 0.108 0.031 3.46
2 blood pressure readings 0.205 0.028 7.35
Lipid profile 0.154 0.018 8.67
Patients who Smoke
Smoking advice 0.072 0.064 1.12
Smoking program 0.136 0.144 0.95
Smoking cessation drug 0.072 0.034 2.11
  1. *whether specified quality of care indicator was discussed, recommended, or performed during a one year timeframe.
  2. eGFR – Estimated Glomerular Filtration Rate; ACR – Albumin-to-Creatinine ratio; HbA1c – Hemoglobin A1c.