Figure 3
Effect of ozone on FEF25-75 and 95% CI according to genotype score and vitamin C intake. Persistently asthmatic children with vitamin C intake between 30 to 105 mg/day (low diet) and with 4 to 6 risk alleles had lower levels of FEF25-75 than children with either 1 to 3 risk alleles or dietary vitamin C intake higher than 105 mg/day (high diet). Linear mixed models were adjusted for age, gender, BMI, height, cohort, time, use of bronchodilator, and previous day’s minimum temperature. N = 137 asthmatic children and 2715 repeated measures.