Research Article
Seasonal Variation of Testosterone Levels in a Large Cohort of Men
Table 2
Bioavailable testosterone levels stratified by age, BMI, smoking status, diabetes, CVD, hypertension, and hyperlipidemia.
| | N | Mean | Median | Range | value |
| All | 7940 | 7.0 ± 2.7 | 6.6 | 0.7–30.2 | | Age | 20–25 | 701 | 9.0 ± 3.2 | 8.5 | 1.0–23.1 | <0.001 | 25–30 | 1190 | 8.1 ± 3.0 | 7.6 | 1.6–30.2 | | 30–35 | 1279 | 7.4 ± 2.6 | 7.0 | 1.3–18.2 | | 35–40 | 827 | 7.0 ± 2.4 | 6.7 | 1.8–17.7 | | 40–45 | 606 | 7.0 ± 2.6 | 6.5 | 2.4–25.6 | | 45–50 | 578 | 6.8 ± 2.3 | 6.4 | 1.5–16.8 | | 50–55 | 675 | 6.3 ± 2.1 | 6.0 | 1.5–13.1 | | 55–60 | 773 | 6.0 ± 2.1 | 5.6 | 0.7–18.7 | | 60–65 | 740 | 5.9 ± 1.9 | 5.5 | 1.3–13.2 | | 65–70 | 571 | 5.6 ± 1.9 | 5.4 | 1.2–14.5 | | BMI (kg/m2) | (<18.5) | 122 | 8.0 ± 3.3 | 7.3 | 1.2–17.5 | <0.001 | (18.5, 25) | 2892 | 7.7 ± 2.8 | 7.4 | 0.7–30.2 | | (25, 30) | 3146 | 6.8 ± 2.6 | 6.4 | 1.4–28.7 | | (30, 35) | 1240 | 6.2 ± 2.3 | 5.8 | 1.3–17.7 | | (35, 40) | 361 | 5.7 ± 2.0 | 5.2 | 2.2–12.6 | | (>40) | 124 | 5.4 ± 2.2 | 4.9 | 2.0–15.9 | | Unknown | 55 | 7.5 ± 2.8 | 6.8 | 3.2–16.1 | | Smoking status | Never | 4829 | 7.1 ± 2.7 | 6.6 | 1.0–30.2 | <0.001 | Now | 1774 | 7.2 ± 2.7 | 6.9 | 0.7–25.6 | | Past | 1113 | 6.4 ± 2.4 | 6.0 | 1.6–20.4 | | Unknown | 224 | 7.1 ± 2.6 | 6.8 | 2.3–14.1 | | Diabetes | No | 6864 | 7.2 ± 2.7 | 6.8 | 1.0–30.2 | <0.001 | Yes | 1076 | 6.0 ± 2.1 | 5.6 | 0.7–18.7 | | CVD | No | 7471 | 7.1 ± 2.7 | 6.7 | 0.7–30.2 | <0.001 | Yes | 469 | 5.8 ± 2.0 | 5.5 | 1.3–14.5 | | Hypertension | No | 6378 | 7.3 ± 2.7 | 6.9 | 0.7–30.2 | <0.001 | Yes | 1562 | 6.0 ± 2.1 | 5.6 | 1.3–18.7 | | Hyperlipidemia | No | 6235 | 7.2 ± 2.7 | 6.8 | 0.7–30.2 | <0.001 | Yes | 1705 | 6.3 ± 2.2 | 6.0 | 1.2–18.7 | |
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Testosterone levels are expressed in nmol/L.
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