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Serum melatonin in pregnant and non-pregnant women
| Serum melatonin in the first semester (pmol/l) | 29.7 +/- 9.9 |
| Serum melatonin in the second semester (pmol/l) | 39.1 +/- 11.2 |
| Serum melatonin in the third semester (pmol/l) | 76.5 +/- 38.3 |
| Non-pregnant(pmol/l) | 41.7 +/- 15.5 |
