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.

NMeanMedianRange value

All79407.0 ± 2.76.60.7–30.2
Age
 20–257019.0 ± 3.28.51.0–23.1<0.001
 25–3011908.1 ± 3.07.61.6–30.2
 30–3512797.4 ± 2.67.01.3–18.2
 35–408277.0 ± 2.46.71.8–17.7
 40–456067.0 ± 2.66.52.4–25.6
 45–505786.8 ± 2.36.41.5–16.8
 50–556756.3 ± 2.16.01.5–13.1
 55–607736.0 ± 2.15.60.7–18.7
 60–657405.9 ± 1.95.51.3–13.2
 65–705715.6 ± 1.95.41.2–14.5
BMI (kg/m2)
 (<18.5)1228.0 ± 3.37.31.2–17.5<0.001
 (18.5, 25)28927.7 ± 2.87.40.7–30.2
 (25, 30)31466.8 ± 2.66.41.4–28.7
 (30, 35)12406.2 ± 2.35.81.3–17.7
 (35, 40)3615.7 ± 2.05.22.2–12.6
 (>40)1245.4 ± 2.24.92.0–15.9
 Unknown557.5 ± 2.86.83.2–16.1
Smoking status
 Never48297.1 ± 2.76.61.0–30.2<0.001
 Now17747.2 ± 2.76.90.7–25.6
 Past11136.4 ± 2.46.01.6–20.4
 Unknown2247.1 ± 2.66.82.3–14.1
Diabetes
 No68647.2 ± 2.76.81.0–30.2<0.001
 Yes10766.0 ± 2.15.60.7–18.7
CVD
 No74717.1 ± 2.76.70.7–30.2<0.001
 Yes4695.8 ± 2.05.51.3–14.5
Hypertension
 No63787.3 ± 2.76.90.7–30.2<0.001
 Yes15626.0 ± 2.15.61.3–18.7
Hyperlipidemia
 No62357.2 ± 2.76.80.7–30.2<0.001
 Yes17056.3 ± 2.26.01.2–18.7

Testosterone levels are expressed in nmol/L.