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Serum kynurenine (kyn) to tryptophan (trp) ratio (median, interquartile range) in subjects who smoked today or yesterday and other ever-smokers.
| Kyn/trp (µmol/mmol) | Subjects who smoked today or yesterday | n | Other ever-smokers | n | P |
|---|---|---|---|---|---|
| All | 26·7 (23·8–31·5) | 104 | 30·0 (26·0–36·6) | 253 | < 0·0001 |
| Female | 27·0 (23·9–31·0) | 52 | 28·6 (24·9–33·9) | 96 | 0·061 |
| Male | 26·3 (23·3–32·0) | 52 | 31·9 (27·2–37·9) | 157 | < 0·0001 |
Statistics: Mann–Whitney U-test.
