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Table 3 ICC estimates for clinical outcomes

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

Clinical Outcome N Average cluster size Mean Standard Deviation ICC
All patients
SBP 4771 57 130.8 16.6 0.054
DBP 4771 57 75.5 10.1 0.094
LDL 3805 45 2.43 0.93 0.035
HDL 3355 40 3.39 0.78 0.020
FBG 4053 48 6.64 2.2 0.023
eGFR 4000 48 72 18.6 0.015
ACR 1589 19 9.4 43.6 0.000*
Patients with Hypertension
SBP 3746 45 132.6 16.6 0.055
DBP 3746 45 76.1 10.2 0.091
Patients with Dyslipidemia
LDL 3395 40 2.39 0.94 0.033
HDL 2997 36 3.38 0.77 0.019
Patients with Diabetes
SBP 2226 27 130.9 16.4 0.038
LDL 1856 22 2.23 0.9 0.054
HDL 1663 20 3.38 0.8 0.039
HbA1c 1999 24 0.074 0.0 0.003
FBG 1986 24 7.83 2.6 0.022
eGFR 1963 23 73.9 19.7 0.016
ACR 1199 14 10.23 44.0 0.000*
Patients with Chronic Kidney Disease
eGFR 859 10 51.5 16.79 0.058
SBP 922 11 130 18.02 0.078
DBP 921 11 72.8 10.73 0.115
Patients with Coronary Artery Disease
SBP 1452 17 128.2 17.75 0.069
DBP 1453 17 72.9 10.12 0.124
LDL 1136 14 2.13 0.78 0.053
HDL 1049 12 3.29 0.75 0.006
Patients who Smoke
SBP 995 12 130.4 17.3 0.013
DBP 994 12 76.7 10.1 0.070
LDL 757 9 2.58 1.0 0.026
HDL 611 7 3.55 0.8 0.018
  1. SBP – Systolic Blood Pressure, DBP – Diastolic Blood Pressure, LDL – Low Density Lipoprotein, HDL – High Density Lipoprotein, FBG – Fasting Blood Glucose, eGFR – Estimated Glomerular Filtration Rate, ACR – Albumin-to-Creatinine ratio, HbA1c – Hemoglobin A1c; *Negative ICCs were considered a result of sampling error and were set to zero.