GSTP1 and asthma: In analyses stratified by genotype, there was an association between ozone and current wheeze (OR = 3.67; 95% CI: 1.05, 12.7; Ntotal = 405) in GSTP1 rs1138272 minor allele carriers, and between PM2.5 and current asthma in all strata examined, although small sample size for some strata resulted in highly imprecise estimates.