Urban Tree Canopy and Asthma, Wheeze, Rhinitis, and Allergic Sensitization to Tree Pollen in a New York City Birth Cohort

http://dx.doi.org/10.1289/ehp.1205513



Table 3. Outcome distributions according to quartiles (Q) of tree canopy coverage (%).a
  Q1
2.5–9.5%
Q2
9.5–13.5%
Q3
13.5–21.1%
Q4
21.1–41.4%
aQuartiles were created for tree canopy coverage within a 0.25-km buffer around the prenatal address for 549 participants with one or more of these outcomes assessed. bAssessment was based on the BRQ. cAssessment was based on the ISAAC Questionnaire. dIgE antibodies were dichotomized at 0.35 IU/mL to define allergic sensitization to each specific allergen.
Reported asthma diagnosis at age 5 yearsb 26 30 24 31
Wheeze at age 5 yearsc 25 31 23 24
Rhinitis at age 5 yearsc 2 3 4 3
Reported asthma diagnosis at age 7 yearsb 32 36 34 39
Wheeze at age 7 yearsc 25 25 23 26
Rhinitis at age 7 yearsc 2 6 9 2
Any specific allergic sensitizationd 45 48 42 46
Allergic sensitization to tree pollend 12 18 20 26