Figure 1From: Chronic disease prevalence from Italian administrative databases in the VALORE project: a validation through comparison of population estimates with general practice databases and national survey Age distribution in each region from each data source. Age distribution in each region of the sample extracted from administrative databases (Admin), of the sample extracted from clinical data collected by GPs participating to the Health Search Database (GP) and of the sample participating to the National Health Survey (Surv).Back to article page