Table 7.
Correlation between the quantitative variables
| 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 |
* Correlation is significant at the 0.05 level (2-tailed); ** correlation is significant at the 0.01 level (2-tailed)