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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.