Seasonal Variation of Testosterone Levels in a Large Cohort of Men

Table 1

Total testosterone levels stratified by age, BMI, smoking status, diabetes, CVD, hypertension, and hyperlipidemia.

	N	Mean	Median	Range	value
All	27328	15.2 ± 5.7	14.5	3.6–37.0
Age
20–25	2568	17.6 ± 6.1	17.1	3.6–37.0	<0.001
25–30	4016	16.4 ± 5.9	15.7	3.6–37.0
30–35	3981	15.5 ± 5.6	14.7	4.0–36.8
35–40	2896	14.9 ± 5.6	14.2	3.6–36.7
40–45	2227	14.9 ± 5.8	14.1	3.6–36.3
45–50	2059	14.5 ± 5.5	13.8	3.8–36.7
50–55	2375	14.3 ± 5.3	13.7	3.6–35.8
55–60	2711	14.1 ± 5.3	13.3	3.6–36.9
60–65	2557	14.3 ± 5.3	13.6	4.0–36.1
65–70	1938	14.2 ± 5.3	13.3	3.7–36.8
BMI (kg/m^2)
(<18.5)	388	19.4 ± 6.2	19.0	4.4–35.9	<0.001
(18.5, 25)	9879	17.4 ± 5.8	16.8	3.6–37.0
(25, 30)	10851	14.6 ± 5.2	14.0	3.6–36.9
(30, 35)	4375	12.8 ± 4.8	12.0	3.6–36.7
(35, 40)	1203	11.4 ± 4.3	10.5	3.6–33.3
(>40)	459	10.3 ± 4.2	9.4	3.6–36.1
Unknown	173	15.0 ± 6.1	13.6	5.4–32.3
Smoking status
Never	16413	15.1 ± 5.6	14.3	3.6–36.9	<0.001
Now	6544	16.0 ± 6.0	15.3	3.6–37.0
Past	3784	14.4 ± 5.4	13.6	3.6–36.7
Unknown	587	14.9 ± 5.6	14.3	4.3–35.7
Diabetes
No	23639	15.5 ± 5.7	14.8	3.6–37.0	<0.001
Yes	3689	13.2 ± 5.2	12.2	3.6–36.8
CVD
No	25709	15.3 ± 5.7	14.6	3.6–37.0	<0.001
Yes	1619	13.5 ± 5.1	13.0	3.6–36.8
Hypertension
No	22090	15.6 ± 5.8	14.9	3.6–37.0	<0.001
Yes	5238	13.4 ± 5.0	12.6	3.6–36.8
Hyperlipidemia
No	21261	15.5 ± 5.8	14.8	3.6–37.0	<0.001
Yes	6067	14.1 ± 5.2	13.2	3.7–36.8

Testosterone levels are expressed in nmol/L.