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| Variable | Cases (n = 67) COPD | Controls (n = 67) Smokers, non-COPD | P |
|---|---|---|---|
| Epinephrine (μg/d) | 2·33 ± 2·11 | 2·15 ± 1·55 | 0·69 |
| Norepinephrine (μg/d) | 21·9 ± 11·5 | 23·6± 16·6 | 0·94 |
| Metanephrine (μg/d) | 27·9 ± 20·9 | 35·2 ± 34·9 | 0·72 |
| Normetanephrine (μg/d) | 63·9 ± 58·7 | 69·3 ± 78·0 | 0·55 |
