Table 1 The participant studies, with details of geographic units, period of data gathering, and number of children aged 6–12 with information on age, sex, and any mould
StudyNumber of study areasMain health questionnaire periodNumber of childrenMain age range (years)
Linz study, Austria8 areas in 1 townJan 1996–Dec 199838146–8
Bulgaria (CESAR study)4 areas in 3 townsFeb–Mar 199635247–11
Czech Republic (CESAR study)4 areas in 1 townFeb–May 199633917–11
Bitterfeldt study, Germany3 areas in 3 townsSep 1992–Jul 199319756–12
Hungary (CESAR study)5 areas in 5 townsFeb–Mar 199636037–11
Sidria study, Italy29 areas in 22 townsOct 1994–Mar 199595026–10
24-school study, The Netherlands24 areas in 19 townsApr 1997–Jul 199820427–12
24-city study, North America24 areas in 24 townsSep–Nov in 1988–9015 2228–11
Poland (CESAR study)4 areas in 4 townsMar–Apr 199628697–11
10-city study, Russia13 areas in 10 townsApr–May 199954198–12
Slovakia (CESAR study)4 areas in 3 townsFeb 199629917–11
Scarpol study, Switzerland10 areas in 10 townsOct 1992–Mar 199327476–12
Total132 areas in 105 towns57 099