Pediatric patient asthma-related emergency department visits and admissions in Washington, DC, from 2001–2004, and associations with air quality, socio-economic status and age group

Table 1 Risk Factor Associations with ED Visits for Ages 5–12 yrs

Risk Factor Increase	Risk Factor	Mean % Change in Daily Visits per Risk Factor Increase	T-test p-value
0.01 ppm	Ozone	3.2 (1.4, 5)	0.000
1 μg m^-3	PM2.5	-0.2 (-0.6, 0.2)	0.331
1000 spores m^-3	Mold Count	-0.2 (-1.1, 0.7)	0.707
10 grains m^-3	Weed Pollen	-2.9 (-6.8, 1.1)	0.148
100 grains m^-3	Tree Pollen	1.8 (0.9, 2.6)	0.000
10 grains m^-3	Grass Pollen	1.6 (-2, 5.4)	0.378
1°F	Temperature	0.2 (0.1, 0.4)	0.007

The numbers in parenthesis represent the lower and upper 95% confidence limits for the percent change in visits.

ISSN: 1476-069X