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Table 3 Spearman rank correlation matrix of personal and stationary site endotoxin in relation to indoor-outdoor home and ambient endotoxin and air pollutions

From: Personal endotoxin exposure in a panel study of school children with asthma

   Riverside   Whittier
  Personal Endotoxin Indoor Endotoxin Outdoor Endotoxin Ambient Endotoxin Personal Endotoxin Indoor Endotoxin Outdoor Endotoxin Ambient Endotoxin
Indoor Endotoxin 0.10 1.00 0.46* 0.41* -0.14 1.00 0.55** 0.52**
Outdoor Endotoxin 0.21 0.46* 1.00 0.83** -0.19 0.55** 1.00 0.73**
Ambient Endotoxin 0.32** 0.41* 0.83** 1.00 -0.02 0.52** 0.73** 1.00
Personal exposures         
   PM2.5 -0.24* 0.49* -0.61** -0.57** -0.16** 0.16 0.24* 0.03
   EC 0.15 -0.22 0.23 0.31 0.40** -0.13 -0.08 -0.22*
   OC 0.27** -0.19 0.12 0.05 0.41** 0.03 0.05 0.004
   NO2 0.13 0.57 -0.07 -0.12 -0.05 0.15 0.21* 0.02
   Temperature 0.22* -0.40 -0.22 -0.27 -0.41** 0.15 0.42** 0.40**
   Relative Humidity -0.04 0.48 -0.22 -0.17 0.09 -0.04 -0.34** -0.46**
Indoor exposures         
   PM2.5 -0.14 0.66** -0.13 -0.19 -0.16 0.27** 0.32** 0.04
   EC -0.18 0.73** 0.02 0.02 -0.10 0.19 0.36** 0.09
   OC -0.20 0.39* -0.25 -0.36* 0.11 0.30** 0.28** 0.01
   Temperature -0.34 0.11 0.19 0.05 -0.33** 0.04 0.27** 0.29*
   Relative Humidity 0.35 0.41* -0.21 -0.10 0.023 0.11 -0.23* -0.37*
Outdoor exposures         
   PM2.5 -0.13 0.80** -0.03 0.13 -0.26* -0.12 0.23* 0.05
   EC -0.04 0.24 0.35* 0.52** -0.02 0.02 0.33** 0.19
   OC -0.37 0.21 0.09 0.23 -0.07 0.02 0.33** 0.14
Ambient exposures         
   PM2.5 -0.26* 0.70** -0.15 -0.03 -0.24** -0.14 0.10 0.03
   EC -0.16 0.03 0.28 0.13 -0.0003 -0.10 0.37** 0.32**
   OC -0.29** 0.14 -0.04 -0.08 -0.15* -0.07 0.34** 0.31**
   NO2 -0.25* -0.01 0.06 0.02 0.04 0.04 0.32** 0.20
   Temperature 0.02 -0.64** 0.19 0.18 -0.43** 0.17 0.35** 0.36**
   Relative Humidity 0.07 0.54** 0.01 0.12 0.02 -0.12 -0.33** -0.27**
  1. EC: elemental carbon; OC: organic carbon. * p < 0.05; ** p < 0.01.