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Table 1 Characteristics of the study population of 257 asthmatic children residing in Mexico City 1998-2004

From: Ozone exposure, vitamin C intake, and genetic susceptibility of asthmatic children in Mexico City: a cohort study

Characteristic % or median(IQR)*
Gender (%male) 63.4
Age (years) 9.0 (7.2-11.0)
Height (cm) 134 (123–145)
BMI 18.5(16.1-21.6)
Antioxidant Study participants (%) 56.0
Vitamin C intake
Supplementation group (%) 30.4
Vitamin C intake in supplementation group (mg/d) 346 (329–375)
Vitamin C intake out of supplementation group (mg/d) 105 (84–131)
Asthma severity
Moderate- and severe-persistent asthma (%) 39.3
Mild-persistent asthma (%) 24.5
Mild-intermittent asthma (%) 36.2
Atopy (%)Ϫ 83.7
Genotype and allele frequency n(%)
GSTM1 (Number of copies) †
0 93 (36.2)
1 129 (50.2)
2 35 (13.6)
GSTP1 rs1695
Val/Val 85 (33.1)
Ile/Val 113 (44.0)
Ile/Ile 59 (22.9)
Ile/Ile + Ile/Val 172 (66.9)
NQO1 rs1800566 ‡  
Pro/Pro 67 (33.7)
Pro/Ser 88 (44.2)
Ser/Ser 44 (22.1)
Pro/Ser + Ser/Ser 132 (66.3)
Ethnicity (%) § Mean (SD)
Native-American 70.9 (13.3)
European 26.2 (12.4)
African 2.9 (2.1)
  1. †n = 257; ‡n = 199; § n = 160.
  2. *Median(Q25-Q75); Ϫ Defined by skin test.