Table I.

Characteristics of the Cincinnati Childhood Asthma and Air Pollution Study Cohort

Characteristics of the Cohort	Total in Cohort n (%)*
Total no. of children in the cohort at age 7 years	589 [77% of those enrolled at age 1y 95% of those enrolled at age 7y]
Gender: Male	323 (54.8%)
Race: African American	124 (21.2%)
Household income < $20K	95 (16.7%)
Breast fed for ≥ 4mo	312 (53.1%)
Exposure to ETS	159 (27.0%)
Parental asthma	240 (40.8%)
Sensitization to ≥ 1 aeroallergen at: → 1year → 3 years	105 (19.0%) 231 (41.5%)
Sensitization to Milk at: → 1year → 3years	21 (3.8%) 8 (1.4%)
Sensitization to Milk at: → 1year → 3years	67 (12.2%) 30 (5.4%)
Eczema	126 (21.6%)
Dog ownership^	244 (41.4%)
Cat ownership^	164 (27.8%)
Daycare attendance^	307 (52.1%)
Mean avg. daily ECAT exposure at: → At age 3 years → From birth-3 years	0.37 (SD 0.12)µg/m3 0.38 (SD 0.28) µg/m3
ECAT exposure ≥ 75th percentile	148 (25.1%)
Asthma at age 7 years	103 (17.5%)
Positive ucAPI at 3 years	68 (12.3%)
Persistent wheezing at 3 years	54 (10.6%)
Children with a positive API and persistent wheezing at 3 years	45 (9.0%)

^*Total N = 589 but may differ for each category due to missing data.

^{^}Between birth-3 years

Eczema was defined as physician reported eczema at any age by or before 3 years.

ucAPI= Adapted Asthma Predictive Index; ETS= environmental tobacco smoke; ECAT= Elemental Carbon Attributable to Traffic.