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. Author manuscript; available in PMC: 2015 Feb 1.
Published in final edited form as: Environ Res. 2014 Jan 11;129:11–19. doi: 10.1016/j.envres.2013.12.001

Table 4.

Relative odds of an asthma visit associated with each interquartile range increase in mean pollutant concentrations among School-Based Asthma Therapy intervention and usual care groups, by lagged averaging time. All models adjusted for 7-day mean temperature (1 degree of freedom) and relative humidity (3 degrees of freedom)

Pollutant Pollutant averaging time* IQR School-based intervention
(n=31) 		Usual care (n=43)
Number of visits OR (95% CI) p Number of visits OR (95% CI) p
Ultrafine particles (p/cm3) 1-day 3007 37 1.11 (0.68–1.79) 0.69 48 0.72 (0.44–1.16) 0.18
2-day 2514 37 1.40 (0.86–2.28) 0.18 48 0.80 (0.50–1.30) 0.37
3-day 2224 37 1.49 (0.93–2.39) 0.10 48 0.94 (0.58–1.52) 0.80
4-day 2088 37 1.42 (0.89–2.27) 0.14 47 1.10 (0.65–1.87) 0.71
5-day 2011 37 1.22 (0.72–2.09) 0.46 46 1.21 (0.64–2.29) 0.55
6-day 1913 36 1.41 (0.79–2.51) 0.25 46 1.14 (0.59–2.21) 0.70
7-day 1841 36 1.26 (0.67–2.36) 0.47 46 1.03 (0.51–2.10) 0.93
Carbon monoxide (ppm) 1-day 0.19 40 1.44 (0.85–2.46) 0.18 52 0.87 (0.53–1.41) 0.57
2-day 0.18 40 1.56 (0.89–2.75) 0.12 52 0.89 (0.52–1.51) 0.66
3-day 0.17 40 1.66 (0.94–2.92) 0.08 52 1.08 (0.63–1.87) 0.78
4-day 0.17 40 1.79 (1.00–3.23) 0.05 52 1.25 (0.71–2.21) 0.45
5-day 0.17 40 1.95 (1.05–3.62) 0.03 52 1.25 (0.69–2.29) 0.46
6-day 0.17 40 2.00 (1.03–3.87) 0.04 51 1.34 (0.71–2.52) 0.37
7-day 0.17 40 2.05 (1.03–4.11) 0.04 51 1.37 (0.70–2.69) 0.35
Ozone (ppb) 1-day 14.2 40 0.92 (0.40–2.11 0.85 51 0.90 (0.45–1.82) 0.78
2-day 13.1 40 0.56 (0.22–1.43) 0.23 51 0.98 (0.45–2.14) 0.97
3-day 12.7 39 0.52 (0.18–1.52) 0.23 51 0.87 (0.37–2.08) 0.76
4-day 12.9 39 0.35 (0.10–1.25) 0.11 51 0.79 (0.29–2.18) 0.65
5-day 12.6 39 0.33 (0.10–1.12) 0.08 51 0.49 (0.16–1.53) 0.22
6-day 12.9 39 0.35 (0.09–1.33) 0.12 51 0.46 (0.13–1.66) 0.24
7-day 12.5 39 0.37 (0.09–1.45) 0.15 51 0.54 (0.15–1.94) 0.34

IQR: interquartile range; p/cm3: parts per cubic centimeter; ppm: parts per million; ppb: parts per billion;

*

1-day = lag day 0, same day as pediatric asthma visit; 2-day = mean of lag days 0 and 1; 3-day = mean of lag days 0–2; 4-day = mean of lag days 0–3; 5-day = mean of lag days 0–4; 6-day = mean of lag days 0–5; 7-day = mean of lag days 0–6