Method of data collection in each country
| Countries by continent | No. of doctors involved in data collection | Stratification of sampling | Reporting time |
|---|---|---|---|
| Europe | |||
| France | 835 | Region, age of doctor, community size, activity level, sex of doctor, environment (typology of areas) | 7 consecutive days per quarter |
| Germany | 2806 | Region, specialty, community size | 7 consecutive days per quarter |
| Spain | 850 | Region, specialty, community size | 7 consecutive days per quarter |
| UK | 500 | Region, year of doctor qualification | Daily throughout year (computerised GP records) |
| South America | |||
| Argentina | 470 | Region, specialty | 7 consecutive days per quarter |
| Brazil | 1155 | Region, specialty | 5 consecutive days |
| Mexico | 1050 | Region, specialty | Minimum of 4 consecutive days and maximum of 6 per quarter |
| North America | |||
| USA | 1227 physicians report per month; 3678 physicians report per quarter | Two staged stratified cluster, randomly drawn | 2 consecutive days per quarter |
| Canada | 652 | Region, specialty | 2 consecutive days per quarter |