Table 2:

Asthma control status and preceding week’s air quality and pollen severity index^a,b

	Model 1c	Model 2d	Model 3e	Model 4f
	Beta (95% CI)	Beta (95% CI)	Beta (95% CI)	Beta (95% CI)
PM2.5	0.32*** (0.16, 0.48)	NI	NI	0.37*** (0.17, 0.56)
O3	NI	−0.02 (−0.15, 0.12)	NI	−0.16┼ (−0.34, 0.02)
Pollen	NI	NI	0.35* (0.05, 0.65)	0.44* (0.06, 0.83)
Season (Ref: Fall)
Spring	0.23 (−0.61, 1.07)	0.15 (−0.62, 0.93)	−0.19 (−0.93, 0.54)	−0.03 (−0.96, 0.90)
Child’s age	−0.06 (−0.24, 0.12)	−0.01 (−0.17, 0.16)	−0.01 (−0.16, 0.14)	−0.05 (−0.24, 0.13)
Child’s sex (Ref: Girl)
Boy	0.47 (−0.32, 1.26)	0.43 (−0.33, 1.19)	0.49 (−0.19, 1.17)	0.30 (−0.53, 1.13)
Child’s race/ethnicity (Ref: White)
Black	0.78 (−0.23, 1.79)	0.47 (−0.49, 1.42)	0.56 (−0.30, 1.43)	0.89┼ (−0.16, 1.94)
Hispanic	0.82┼ (−0.15, 1.78)	0.30 (−0.63, 1.22)	0.48 (−0.36, 1.31)	0.82 (−0.18, 1.83)
Other	−0.06 (−1.56, 1.44)	−0.16 (−1.65, 1.33)	−0.19 (−1.55, 1.18)	−0.06 (−1.60, 1.48)
Parent’s age	−0.03 (−0.08, 0.03)	−0.03 (−0.08, 0.02)	−0.03 (−0.07, 0.02)	−0.03 (−0.08, 0.02)
Marital status (Ref: Married)
Not married	0.96* (0.15, 1.76)	0.80* (0.03, 1.57)	0.78* (0.08, 1.48)	1.01* (0.17, 1.84)
Education (Ref: College or above)
High school or below	0.94* (0.07, 1.81)	1.04* (0.20, 1.89)	0.84* (0.11, 1.57)	1.05* (0.13, 1.97)
No. of chronic conditions	0.80** (0.32, 1.29)	0.70** (0.22, 1.19)	0.65** (0.23, 1.07)	0.90** (0.38, 1.43)

NI = Variables were not included in the modeling

^aThe results were based on the parameters of ≥3 monitoring days/week and a distance ≤30km for measuring air pollutants (see Table 3 for results of sensitivity analyses);

^bHigher scores indicate worse asthma control status;

^cModel 1 only includes PM_2.5;

^dModel 2 only includes O₃;

^eModel 3 only includes pollen;

^fModel 4 includes PM_2.5, O₃, and pollen.

^┼p<0.1;

^*p<0.05;

^**p<0.01;

^***p<0.001.