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Table 1 Cohort characteristics (N = 143)

From: Effect of personal exposure to black carbon on changes in allergic asthma gene methylation measured 5 days later in urban children: importance of allergic sensitization

Characteristic Seroatopya
(n = 75)
Non-atopy
(n = 68)
P valueh
Maternal ethnicity    0.34
Dominican 45/75 (60%) 46/68 (68%)  
African American 30/75 (40%) 22/68 (32%)  
Age mean [min–max], years 12.7 [10.4–14.3] 12.8 [10.5–14.0] 0.40
Girls 38/75 (51%) 39/68 (57%) 0.42
Maternal high-school degree or greater 40/74 (54%) 38/63 (60%) 0.46
Maternal asthma (+) 23/75 (31%) 19/68 (28%) 0.72
Prenatal ETS exposureb (+) 23/74 (31%) 22/67 (33%) 0.62
Current ETS exposurec (+) 7/67 (10%) 8/60 (13%) 0.82
Asthmad 44/75 (59%) 30/68 (44%) 0.08
BMIe z score, median [IQR] 1.15 [1.43] 0.91 [1.35] 0.28
Overweight (≥85th percentile) 40/75 (53%) 33/68 (49%) 0.57
Obesity (≥95th percentile) 24/75 (32%) 12/68 (18%) <0.05
Personal BCf μg/m3, median [IQR]
 Day 1 1.23 [1.01] 1.27 [1.07] 0.68
 Day 6 1.12 [1.25] 1.24 [1.29] 0.45
FeNO ppbg, median [IQR]
 Day 1 14.5 [15.3] 8.8 [8.85] <0.01
 Day 6 15.4 [12.4] 9.3 [8.81] <0.01
  1. IQR interquartile range
  2. aTotal IgE ≥80 IU/ML at age 7, 9, or 11 year
  3. bReport of any smoker in the house during pregnancy
  4. cReport of any smoker in the home during the 1-week sampling period
  5. dDetermined by a specialist physician using standardized criteria at age 5–12 years [42]
  6. eBody mass index (BMI) calculated by weight (kg)/height (m)2, standard deviation (SD)
  7. fPersonal BC measured at time 1
  8. gFeNO measured at time 1, n = 31 missing due to either invalid data or ambient NO >100 ppb
  9. hChi-square test for categorical variables and Mann-Whitney test for continuous variables (age, BMI z score, personal BC, and FeNO)