Table 1

Cross-sectional studies. Data presented but not included in meta-analyses

Reference number	Year published	Country	Age	No.	Population
4	77	US	7 -–17	816	316 families in 3 towns
29	81	US	5–13	12 748	Children attending schools in 7 metropolitan areas
30	82	US	8–12	558	Selected schools in 2 polluted, 1 non-polluted communities in Arizona
31	84	US	5–14	3175	Sample of 14 schools
32	85	Italy	−11	2385	Schools in Turin near air pollution monitoring stations
33	86	Israel	2 and 5 grade	1699	Children living near power stations
34	89	UK	7	130	Low birth weight cohort
35	89	US	7–17	1357	3 towns: residents canvassed
36	89	France	6–10	1160	945 families from 7 cities
37	90	Malaysia	7–12	1214	School based sample
38	90	US	14.7	239	Adolescent athletes. Unclear how selected
39	91	Italy	6–11	143	Primary school children in L’Aquila. Sampling unclear
40	91	Israel	2 and 5 grade	8259	Schools in 3 towns
41	92	China	10–13	1343	2 areas in N China, 2 in S China. Sampling unclear
42	92	NZ	9 for 4 yrs	634	Birth cohort
43	93	Australia	8 and 11	4549	36 schools throughout Queensland
44	93	UK	6–11	2756	Representative samples of children in England, Wales and Scotland
45	93	Austria	6–15	1320	3 areas in Tyrol, sampling unclear
46	94	Turkey	9–12	524	3 primary schools
47	96	S. Africa	14–18	395	Children from 2 schools