Table 2

Characteristics and comparability of study samples

		Communities
		Opencast (%)	Control (%)
Age (y):
1–4	27	28
5–8	39	36
9–11	34	35
Sex:
Male	52	48
Household:
Not owner occupied	35	35
Unemployed^2-150	12	10
No car access	18	20
Single adult	15	16
⩾1 Smokers in household	45	43
⩾1 Indicators of damp	17	22
Polluting heating^2-151	66	63
Polluting cooking^2-152	44	59
Present address for most of life1^§	85	91
Long term work in dusty industry^2-154	17	15
Respondents (n)	1639	1577

↵2-150 ⩾1 Adults seeking work.
↵2-151 Coal or open fire, solid fuel, coke, wood, gas fires orbottles, paraffin.
↵2-152 Solid fuel, oil, gas.
^{^§}Child at present address or within half a mile for most of life.
↵2-154 Adult in household worked in agriculture or gardening, coal industry or coal delivery (not opencast), cokeworks, opencast coal extraction, potter or ceramics, printing industry, quarrying or stonemasonry, wood or paper industry.