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. 2005 May 6;113(8):1068–1075. doi: 10.1289/ehp.7533

Table 4.

Distribution of valid FEV1 diurnal variabilitya and lowest daily FEV1a values (mean ± SD) over the six seasonal assessment periods by at-risk status determined by seasonal diary (winter 2001 through spring 2002).

Subgroup of children Person-days (n) Variability FEV1 Lowest daily FEV1
On CSsa 393 15.8 ± 14.2 78.1 ± 17.5
Not on CSs 1,545 15.0 ± 11.6 71.7 ± 18.9
Reporting URIa 231 14.9 ± 12.3 74.0 ± 19.0
Not reporting URI 1,481 15.7 ± 12.3 71.5 ± 19.4
a

See “Materials and Methods” for definitions.