Table 2.
Absolute and percent of variance in HbA1c, SBP and LDL-C attributable to clinic and patient levels
| Random effects | Fully adjusted model | ||
|---|---|---|---|
| HbA1c | SBP | LDL-C | |
| Variance component | Variance (SD) | Variance (SD) | Variance (SD) |
| Clinic level | 0.09 (0.30) | 22.78 (4.77) | 0.03 (0.16) |
| Patient level | 3.63 (1.91) | 285.63 (16.90) | 1.05 (1.02) |
| Percent of total variance | |||
| Clinic level | 2.4% | 7.4% | 2.4% |
| Patient level | 97.6% | 92.6% | 97.6% |
| Intracluster correlation coefficient (ICC) | 0.02 | 0.07 | 0.02 |
Two-level models with a random effect for clinic. All models were adjusted for patient and clinic characteristics. [Likelihood ratio test results showed that two-level models produced better fit compared to single-level models for all three outcomes]
HbA1c glycated haemoglobin, LDL-C low-density lipoprotein cholesterol, SBP systolic blood pressure, SD standard deviation