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Table 1 Demographic characteristics of study subjects*

From: Exposure to NO2, CO, and PM2.5 is linked to regional DNA methylation differences in asthma

  Non-asthmatic Asthmatic
Number of subjects 121 67
Total number of male 59 (48.8%) 35 (52.2%)
Median age at enrollment (years) (quartile 1; quartile 3) 14.7 (12.9; 16.9) 14.6 (13.1; 16.9)
Median BMI (kg/m2) (quartile 1; quartile 3) 21.7 (19.1; 25.6) 22.0 (18.8; 28.0)
Total number of rhinitis 9 (7.8%) 12 (23.1%)
Total number of eczema 11 (9.8%) 8 (15.7%)
Total number of African-American 4 (3.0%21) 5 (7.5%)
Total number of Hispanic or Latino 72 (59.5%) 27 (40.3%)
Total number of Caucasian 34 (28.0%) 15 (22.4%)
Total number of mixed race 5 (4.1%) 3 (4.5%)
Total number of not reported 6 (5.0%) 17 (25.3%)
Total number of exposed to secondhand smoke 12 (10.3%) 7 (12.5%)
Total number of smokers 1 (0.9%) 0 (0%)
Total number of household income < $15,000 35 (28.9%) 15 (22.4%)
Total number of household oncome $15,000–30,000 27 (22.3%) 12 (17.9%)
Total number of household income $31,000–50,000 12 (9.9%) 3 (4.4%)
Total number of household income > $50,000 35 (28.9%) 18 (26.9%)
Total number of household income not reported 12 (9.9%) 19 (28.3%)
  1. BMI body mass index
  2. *Frequencies may not sum to full sample size due to missing data