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Table 2 Correlation coefficient matrix of the exposure variables (Pearson)

From: Ozone is associated with cardiopulmonary and stroke emergency hospital visits in Reykjavík, Iceland 2003–2009

  O3 a PM10 NO2 Temperature Relative humidity
O 3 a 1 0.03 −0.47# −0.03 −0.12#
PM 10   1 0.16# −0.26# −0.32#
NO 2    1 −0.43# 0.07#
Temperature     1 0.11#
Relative humidity      1
  1. a Maximum daily 8-hour mean, daily 24-hour mean for other exposure variables.
  2. P <0.001:#.