Table 2 Spearman correlation coefficients for total daily asthma HAs, ambient O3 concentrations, pollen counts, and meteorological variables in Dallas, Houston, and Austin, Texas, from 2003 to 2011
From: Ambient ozone and asthma hospital admissions in Texas: a time-series analysis
Correlation coefficients (p-value) | Asthma HAs | Average temperature | Dew point | Daily 8-h maximum O3 | Daily total pollen counts |
|---|---|---|---|---|---|
Asthma HAs | 1 | −0.3 | −0.2 | −0.1 | 0.1 |
(<0.0001) | (<0.0001) | (<0.0001) | (<0.0001) | ||
Average temperature | −0.3 | 1 | 0.9 | 0.3 | −0.2 |
(<0.0001) | (<0.0001) | (<0.0001) | (<0.0001) | ||
Dew point | −0.2 | 0.9 | 1 | 0.1 | −0.2 |
(<0.0001) | (<0.0001) | (<0.0001) | (<0.0001) | ||
Daily 8-h maximum O3 | −0.1 | 0.3 | 0.1 | 1 | 0.2 |
(<0.0001) | (<0.0001) | (<0.0001) | (<0.0001) | ||
Daily total pollen counts | 0.1 | −0.2 | −0.2 | 0.2 | 1 |
(<0.0001) | (<0.0001) | (<0.0001) | (<0.0001) |