Table 1.
Characteristics of the study population of 257 asthmatic children residing in Mexico City 1998-2004
| 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) |
†n = 257; ‡n = 199; § n = 160.
*Median(Q25-Q75); Ϫ Defined by skin test.