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Table 7 Correlation between the quantitative variables

From: Air quality index from charcoal production sites, carboxyheamoglobin and lung function among occupationally exposed charcoal workers in South Western Nigeria

Pearson correlation coefficient
Sig (2 tailed)
NO2 SO2 CO CO2 PM2.5 COHb FEV1 PEFR Body mass index
NO2 1         
SO2 0.181**
0.000
1        
CO 0.477**
0.000
0.390**
0.000
1       
CO2 0.261**
0.000
0.422**
0.000
0.525**
0.000
1      
PM 0.441**
0.000
0.212**
0.000
0.717**
0.000
0.261**
0.000
1     
COHb 0.074
0.586
−0.169
0.209
0.104
0.441
0.038
0.781
0.320*
0.015
1    
FEV1 0.036
0.789
−0.144
0.286
−0.173
0.199
−0.005
0.973
−0.027
0.843
−0.075
0.577
1   
PEFR −0.017
0.902
−0.140
0.300
−0.077
0.571
0.024
0.859
−0.082
0.545
−0.122
0.367
0.875**
0.000
1  
BMI −0.071
0.599
0.061
0.655
−0.116
0.392
−0.010
0.943
−0.144
0.284
−0.038
0.777
0.328*
0.013
0.279*
0.036
1
  1. * Correlation is significant at the 0.05 level (2-tailed); ** correlation is significant at the 0.01 level (2-tailed)