Skip to main content

Advertisement

Table 3 Relative risksa of asthma HAs per 10 ppb increase in daily 8-h maximum O3 concentrations in Dallas, Houston, and Austin, Texas, from 2003 to 2011

From: Ambient ozone and asthma hospital admissions in Texas: a time-series analysis

Asthma HAs Same day (lag 0) 1-day lag (lag 1) 2-day lag (lag 2) 4-day average (lag 0–3)
RRa (95% CI) p-value RRa (95% CI) p-value RRa (95% CI) p-value RRa (95% CI) p-value
All ages 1.007
(0.998–1.015)
0.15 1.012
(1.004–1.021)
0.004 1.011
(1.002–1.019)
0.01 1.017
(1.005–1.030)
0.005
5–14 years 1.027
(1.008–1.047)
0.01 1.025
(1.007–1.043)
0.01 1.019
(1.001–1.038)
0.03 1.037
(1.011–1.064)
0.01
15–64 years 1.005
(0.993–1.017)
0.41 1.011
(1.000–1.023)
0.05 1.005
(0.994–1.016)
0.39 1.015
(0.999–1.032)
0.07
65+ years 0.996
(0.977–1.014)
0.64 1.004
(0.986–1.022)
0.67 1.016
(0.998–1.034)
0.07 1.005
(0.980–1.031)
0.69
  1. HA hospital admission, ppb parts per billion, RR relative risk, O 3 ozone, CI confidence interval
  2. aRRs were estimated from Poisson generalized additive models and adjusted for cubic splines of calendar time (8 d.f. per year), cubic splines of same-day temperature (3 d.f.), cubic splines of the average of lag 1 through 3 day temperature (3 d.f.), cubic splines of same-day dew point (3 d.f.), cubic splines of the average of lag 1 through 3 day dew point (3 d.f.), day of the week, and public holidays