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Table 2 Intra-practice correlation coefficients from four recent studies

From: Intra-cluster correlation coefficients in adults with diabetes in primary care practices: the Vermont Diabetes Information System field survey

Characteristic VDIS BEACH CEART MRC HPOP JOGS
Age 0.077 0.153–0.159     0.050
Sex 0.038 0.055–0.066     
Height 0.019   0.053 0.048   
Weight 0.011   0.020 0.012   0.043
Body mass index 0.011   0.031 0.022   0.081
Systolic blood pressure 0.042   0.048    0.018
Diastolic blood pressure 0.017   0.129    0.046
Heart rate 0.015    0.032   
Total cholesterol 0.037   <0.001    0.004
LDL-cholesterol 0.045   0.006    
LDL-cholesterol at goal 0.038   0.027    
Triglycerides 0.014   0.024    
Serum creatinine 0.080   0.00007    
Tobacco use 0.005   0.036 0.006   0.055
Number of medications 0.028     0  
Influenza vaccination 0.058     0.062  
Depressed 0.007     0  
  1. VDIS = Vermont Diabetes Information System (the present study) [7].
  2. BEACH = Bettering the Evaluation and Care of Health [3].
  3. CEART = Cholesterol Education and Research Trial [5].
  4. MRC = Medical Research Council Trial of the Assessment and Management of Older People in the Community [4].
  5. HPOP = Health Promotion for Older People [6].
  6. JOGS = Justification of Green Scripts trial [6]