Table 2

Cross-sectional studies included in meta-analyses

Reference numberYear
published		CountryAgeNo.Population
48 79UK7–11214Community survey
49 83US6–12183Children attending school in Iowa city
50 84US7–17971Population sample
51 84US6–910 106All children in 6 cities with differing air pollution
52 86China8–165711 primary + 1 secondary school in Shanghai
53 86France10–1692Children attending a preventive medicine centre
54 86US10–192630Tecumseh population study
55 87US6–21292Random sample of East Boston children plus their sibs
56 89France9–12434Children from 2 neighbouring areas: 1 polluted, 1 not
57 89Canada7–1240995 rural communities in Ontario, 5 in Saskatchewan
58 90Holland6–1296510 schools
59 90UK777030 primary schools in Edinburgh
60 92Sweden7–10462 schools
61 92Germany9–115164All school children in Munich and S. Bavaria
62 92US6–12316Multistage sample of Tucson families
63 93UK5–72511100 schools in 10 towns
64 94Australia8–112765All schools in 3 areas
65 94US+Canada8–12886322 communities
66 95US9–11876Population based school sample in inner city area
67 95Holland6–124702 schools
68 96Italy12–15317Children from schools in Lazio region of central Italy
69 97Czech14219Sampling unclear. Children from 1 polluted and 1 clean air area