Table III.
Multivariate linear regression models of determinants of both outcome variables.
| Independent variable | Difference | p-value | |
| SDM/KDM | |||
| Age (years) | 0.20 | (0.07 to 0.34) | <0.00 |
| Urban location | −4.60 | (−6.41 to −2.78) | <0.00 |
| Practice assistant involved in diabetes care | 2.27 | (0.49 to 4.06) | 0.01 |
| SDM per standardized practice | |||
| Age (years) | 0.10 | (0.01 to 0.19) | 0.03 |
| Urban location | −2.50 | (−3.63 to −1.37) | <0.00 |
| Practice assistant involved in diabetes care | 1.32 | (0.21 to 2.43) | 0.02 |
| Structured cooperation with a specialized diabetes nurse | −1.21 | (−2.38 to −0.05) | 0.04 |
SDM/KDM, ratio screen-detected diabetic patients/known diabetic patients per practice; SDM per standardized practice, number of screen-detected diabetic patients per standardized (after adjustment for practice size and age distribution) practice. Values are expressed as differences with 95% confidence interval in brackets and reflect changes in SDM/KDM and SDM per standardized practice as a result of one unit increase in the independent variables. R2 adjusted = 0.29 (first model); R2 adjusted = 0.25 (second model).