Table 6. Asthma prevalence and severity among US kindergarten-age children in relation to their estimated HI_DPM exposure at 24 months.

		Asthma				Hospitalization
Decile	Decile Rangec	Prevalence %(CI)e	Unadjusted OR (95% CI)d	Adjustedb OR (95% CI)d		Prevalence %(CI)e	Unadjusted OR (95% CI)d	Adjustedb OR (95% CI)d
1 (low)	0 -<0.035	19.1 (14.2-23.9)	1.00 (referent)	1.00 (referent)		6.9 (4.1-9.8)	1.00 (referent)	1.00 (referent)
2	0.035- <0.048	19.1 (16.2-22.0)	1.00 (0.68-1.47)	1.01 (0.68-1.49)		8.6 (6.1-11.1)	1.27 (0.73-2.19)	1.31 (0.76-2.24)
3	0.048- <0.063	20.3 (15.9-24.7)	1.08 (0.73-1.62)	1.10 (0.74-1.65)		6.8 (4.4-9.2)	0.98 (0.56-1.70)	0.95 (0.56-1.61)
4	0.063- <0.078	14.2 (10.0-18.3)	0.70 (0.44-1.12)	0.72 (0.46-1.12)		6.8 (3.6-10.1)	0.98 (0.47-2.04)	0.96 (0.48-1.92)
5	0.078-0.096	18.0 (13.4-22.5)	0.93 (0.61-1.42)	1.00 (0.66-1.52)		6.8 (4.1-9.5)	0.97 (0.52-1.84)	0.95 (0.53-1.71)
6	0.096- <0.114	18.8 (14.9-22.8)	0.99 (0.66-1.48)	0.97 (0.65-1.47)		6.9 (4.1-9.6)	0.99 (0.53-1.83)	0.85 (0.47-1.56)
7	0.114- <0.134	17.0 (13.9-20.2)	0.87 (0.60-1.27)	0.94 (0.64-1.38)		6.5 (4.1-8.8)	0.93 (0.51-1.71)	0.88 (0.48-1.61)
8	0.134- <0.166	20.0 (14.3-25.6)	1.06 (0.68-1.65)	1.05 (0.67-1.66)		6.5 (3.7-9.3)	0.93 (0.50-1.74)	0.79 (0.42-1.46)
9	0.166- <0.226	13.6 (9.5-17.7)	0.67 (0.42-1.07)	0.64 (0.40-1.04)		5.9 (2.4-9.3)	0.83 (0.38-1.84)	0.72 (0.33-1.59)
10 (high)	0.226-2.224	17.0 (13.2-20.7)	0.87 (0.58-1.30)	0.81 (0.54-1.23)		6.9 (4.3-9.5)	0.99 (0.54-1.82)	0.87 (0.49-1.54)
P-Value(Test for Trend)a			0.25	0.21			0.40	0.12

HI_DPM represents respiratory hazard index from diesel PM.

^a P-value for test for trend: decile number modeled as a continuous variable in logistic regression (df = 1).

^b Adjusted for age, sex, race/ethnicity, income to poverty ratio, urbanicity, and maternal smoking status

^c NATA 2002 Diesel PM. Mean (95% CI) = 0.118 (0.111, 0.124).

^d Odds Ratio (95% confidence interval) from logistic regression model with decile modeled as a categorical variable

^e Percentages and 95% CI are weighted