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Table 1 Summary of Selected Characteristics of CHS FeNO Study Participants

From: Genetic and epigenetic susceptibility of airway inflammation to PM2.5 in school children: new insights from quantile regression

  N (%) Distribution of FeNO
Median (IQR) 0.2 0.4 0.6 0.8 Mean (SD) P-values
Age [mean(range)] 9.3 (6.4,11.7) 9.75 (8.4) 6.5 8.5 11.3 17.3 11.1 (1.9) <0.001
Gender
 Girl 489 (52%) 10.2(7.9) 6.6 8.8 11.5 17 11.2 (1.9) 0.72
 Boy 451 (48%) 9.3(8.85) 6.4 8.3 10.8 17.9 11 (2)
Ethnicity
 Hispanic White 607 (64.6%) 10(8.55) 6.6 8.5 11.9 17.8 11.4 (2) 0.16
 Non-Hispanic White 333 (35.4%) 9.5(7.3) 6.3 8.5 10.9 16.5 10.7 (1.9)
Asthma
 No 807 (85.9%) 9.6(7.75) 6.4 8.4 11.1 16.3 10.6 (1.8) <0.001
 Yes 133 (14.1%) 10.7(22) 7 8.9 14.2 36.4 14.8 (2.4)
History of Respiratory Allergy
 No 418 (44.5%) 9.5(5.975) 6.6 8.4 10.5 14.7 10.2 (1.8) <0.001
 Yes 522 (55.5%) 10.15(10.575) 6.4 8.6 12.8 21.6 11.9 (2)
Exposure to Secondhand Smoke
 No 909 (96.7%) 9.7(8.4) 6.5 8.5 11.3 17.3 11.1 (1.9) 0.92
 Yes 31 (3.3%) 10.8(7.65) 6.5 8.4 12.4 15.2 11 (2)
Body mass index
 Underweight (< 5th percentile) 11 (1.2%) 13.5(6.3) 7.5 11.2 13.8 14.4 12.5 (2) 0.90
 Normal (5th to <85th percentile) 550 (58.5%) 9.7(8.3) 6.6 8.5 11.1 17.1 11 (1.9)
 Overweight (85th to <95th percentile) 183 (19.5%) 9.5(8) 6.4 8.2 10.9 17.8 11.1 (2)
 Obese (≥ 95th percentile) 191 (20.3%) 10(8.35) 6.5 8.7 12.1 18.2 11.3 (2)
Parental Education
 <12th grade 238 (25.3%) 11.15(8.925) 7.4 9.7 13.2 19.0 12.3 (1.9) 0.08
 12th grade 163 (17.3%) 9.6(8.85) 6.1 7.7 11.3 17.5 11 (2.1)
 Some college 302 (32.1%) 9.3(7.375) 6.4 8.1 10.4 16.6 10.9 (2)
 College 125 (13.3%) 9.3(8.5) 6.3 8.4 10.98 16.0 10.6 (1.9)
 Some graduate 112 (11.9%) 9.35(7.45) 6.4 8.0 10.8 16.5 10.2 (1.8)
Annual family income
 <$15,000 275 (29.3%) 10.7(9.5) 7.2 9.5 12.9 19.4 12.3 (2) 0.003
 $15,000 - $49,999 240 (25.5%) 10.35(8.2) 6.5 8.7 12.4 18.3 11.4 (2)
 ≥$50,000 425 (45.2%) 9.1(6.9) 6.3 8.1 10.3 15.7 10.3 (1.9)