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Table 1 Selected Characteristics of CHS participants with and without a lifetime history of physician diagnosed asthma at study entrya

From: Understanding the importance of key risk factors in predicting chronic bronchitic symptoms using a machine learning approach

Variable All participants
(N = 4548), Mean (SD) or N (%)
Asthma
(N = 1199), Mean (SD) or N (%)
No asthma
(N = 3349), Mean or (SD) (SD) or N (%)
Sociodemographic
Age (Years) 6.5 (0.7) 6.5 (0.7) 6.5 (0.7)
Gender
 Male 2324 (51.1%) 695 (58.0%) 1629 (48.6%)
 Female 2224 (48.9%) 504 (42.0%) 1720 (51.4%)
Spanish language questionnaire 1148 (25.2%) 207 (17.3%) 941 (28.1%)
Race/ethnicity
 Hispanic white 2531 (55.7%) 610 (50.9%) 1921 (57.4%)
 Non-Hispanic white 1453 (32.0%) 402 (33.5%) 1051 (31.4%)
 Other 564 (12.4%) 187 (15.6%) 377 (11.3%)
Insurance status 3813 (88.2%) 1057 (92.1%) 2756 (86.8%)
BMI percentile 61.1 (29.8) 63.6 (29.4) 60.2 (29.9)
Education level
 Less than 12th grade (did not finish high school) 942 (21.9%) 179 (15.6%) 763 (24.2%)
 Completed grade 12 (high school) 824 (19.2%) 216 (18.8%) 608 (19.3%)
 Some college or technical school 1628 (37.8%) 512 (44.6%) 1116 (35.4%)
 Completed 4 years of college 501 (11.6%) 131 (11.4%) 370 (11.7%)
 Some graduate training after college 408 (9.5%) 111 (9.7%) 297 (9.4%)
Indoor/home exposures
 Any pets at home 2387 (54.6%) 680 (58.9%) 1707 (53.1%)
 Any pests at home 2811 (68.0%) 777 (70.4%) 2034 (67.0%)
 Carpet at home 4030 (92.6%) 1079 (93.0%) 2951 (92.5%)
 Mildew at home 1018 (24.8%) 323 (30.0%) 695 (22.9%)
 Water damage at home 602 (14.0%) 185 (16.3%) 417 (13.2%)
 Gas stove at home 3701 (85.5%) 989 (86.3%) 2712 (85.3%)
 Parental stressb 4.1 (2.9) 4.1 (2.9) 4.0 (2.9)
 Secondhand smoke exposure 328 (7.5%) 94 (8.1%) 234 (7.3%)
Traffic/air pollution
 24-h average: PM10 (μg/m3) 37.4 (12.3) 37.6 (11.7) 37.3 (12.5)
 24-h average: PM2.5 (μg/m3) 17.6 (6.5) 18.1 (6.3) 17.5 (6.5)
 24-h average: NO2 (ppb) 22.5 (8.2) 23.3 (8.1) 22.2 (8.2)
 8-h (10 am-6 pm) average O3 (ppb) 43.6 (8.7) 44.2 (8.3) 43.4 (8.8)
 CALINE4 freeway NOx (ppb) 15.8 (22.4) 15.3 (18.7) 15.9 (23.6)
 CALINE4 non-freeway NOx (ppb) 5.6 (4.7) 5.5 (4.4) 5.6 (4.8)
Symptoms/medication use
 Wheeze symptom 641 (14.6%) 500 (43.2%) 141 (4.4%)
 Rhinitis (i.e. sneeze/runny nose symptoms) 1458 (33.2%) 622 (53.9%) 836 (25.9%)
 Itchy eyes symptoms 843 (19.3%) 370 (32.3%) 473 (14.7%)
 Any asthma/wheeze medication use 693 (16.2%) 565 (48.8%) 128 (4.1%)
 Bronchitis symptoms 781 (18.1%) 416 (36.7%) 365 (11.5%)
Asthma/eczema
 Parent history of asthma 1067 (24.7%) 478 (42.2%) 589 (18.5%)
 Lifetime history of eczema 618 (14.6%) 246 (21.9%) 372 (12.0%)
 Asthma statusc 599 (13.2%) 599 (50.0%) N/A
 Age of asthma onset (years) 5.8 (4.3) 5.8 (4.3) N/A
  1. aThe characteristics were taken at the study entry in 2003
  2. bLevels of parental stress were assessed on baseline questionnaire via the four–item version of the Perceived Stress Scale (PSS), a composite stress score ranging from 0 to 16. Higher stress score indicates higher stress level
  3. cReported doctor-diagnosed asthma at baseline year