Research Article
Seasonal Variation of Testosterone Levels in a Large Cohort of Men
Table 3
Total and bioavailable testosterone levels determined in different months.
| | N | Mean | Median | value |
| Total testosterone, nmol/L | March | 2334 | 14.7 ± 5.5 | 13.8 | | August | 2130 | 15.7 ± 5.9 | 14.9 | <0.001 | September | 1761 | 15.7 ± 5.9 | 15.1 | <0.001 | October | 2093 | 15.4 ± 5.8 | 14.7 | <0.001 |
| Bioavailable testosterone, nmol/L | March | 734 | 6.7 ± 2.5 | 6.2 | | August | 660 | 7.2 ± 2.8 | 6.7 | <0.001 | September | 486 | 7.0 ± 2.8 | 6.6 | <0.001 | October | 589 | 7.3 ± 3.0 | 6.8 | <0.001 |
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Values are expressed as mean ± SD. value is derived in comparison with levels in March. |