Table 1. Subject characteristics.
| Characteristics | No./total No. (%)* |
|---|---|
| No. of subject | 933 |
| Responded to questionnaire | 919/933 (98.5) |
| Age, mean±SD (year) | 4.87±1.05 |
| Sex (M/F) | 480/453 |
| BMI, mean±SD (kg/m2) | 15.9±1.65 |
| Parental history of allergic disease | 449/916 (49.0) |
| Parental history of asthma | 46/914 (5.0) |
| Parental history of AR | 403/915 (44.0) |
| Parental history of AD | 105/915 (11.5) |
| Environmental tobacco smoking | 412/911 (45.2) |
| Maternal education level | |
| < College degree | 240/905 (26.5) |
| ≥ College degree | 665/905 (73.5) |
| Economic status (monthly income, USD) | |
| Low (< 3,000) | 328/890 (36.9) |
| Middle (3,000–5,000) | 341/890 (38.3) |
| High (≥5,000) | 221/890 (24.8) |
| Biomarker | |
| Eosinophil, mean±SD (%) | 4.17±3.20 |
| Total IgE, mean±SD (IU/mL) | 194.35±376.47 |
| Atopy† | 147/659 (22.3) |
| FeNO, mean±SD (ppb) | 10.31±6.51 |
SD, standard deviation; M, male; F, female; BMI, body mass index; AR, allergic rhinitis; AD, atopic dermatitis; USD, US dollar; IgE, immunoglobulin E; FeNO, fractional exhaled nitric oxide; SPT, skin prick test.
*Data are presented as number/total number (percentage) of patients, unless otherwise indicated; †Defined as at least 1 positive SPT result (an allergen wheal diameter greater than a histamine wheal diameter and a histamine wheal diameter ≥3 mm).