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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)
  1. HA hospital admission, O 3 ozone