Austria, Linz Survey | 8 areas in 1 town | Jan 1996–Dec 1998 | 3776 | 6–8 |
Bulgaria, CESAR study | 4 areas in 3 towns | Feb–May 1996 | 2973 | 7–11 |
Czech Republic, CESAR study | 4 areas in 1 town | Feb–May 1996 | 2962 | 7–11 |
Germany, Bitterfeldt study | 3 areas in 3 towns | Aug 1992–Jul 1993 | 1972 | 6–12 |
Hungary, CESAR study | 5 areas in 5 towns | Feb–May 1996 | 3031 | 7–11 |
Italy, Sidria study | 29 areas in 22 towns | Oct 1994–Mar 1995 | 9073 | 6–10 |
Holland, 24 school study | 24 areas in 19 towns | Apr 1997–Jul 1998 | 1913 | 7–12 |
North America, 24 city study | 24 areas in 24 towns | Sep–Nov in 1988–90 | 14845 | 8–11 |
Poland, CESAR study | 4 areas in 4 towns | Feb–May 1996 | 2643 | 7–11 |
Russia, 10-city study | 13 areas in 10 towns | Apr–May 1999 | 5412 | 8–12 |
Slovakia, CESAR study | 4 areas in 3 towns | Feb–May 1996 | 2531 | 7–11 |
Switzerland, Scarpol study | 10 areas in 10 towns | Oct 1992–Mar 1993 | 2748 | 6–12 |
Total
| 132 areas in 105 towns | | 53879 | |