Sociodemographic, lifestyle and medical influences on serum testosterone and sex hormone-binding globulin in men from UK Biobank.

Abstract:

OBJECTIVE:Serum testosterone concentrations are affected by factors unrelated to hypothalamo-pituitary-testicular axis pathology. We evaluated the impact of sociodemographic, lifestyle and medical factors, on serum testosterone and sex hormone-binding globulin (SHBG) in men aged 40-69 years. DESIGN:Cross-sectional analysis of 208,677 community-dwelling men from the UK Biobank. MEASUREMENTS:We analysed associations of different factors with serum testosterone and SHBG (immunoassays) and calculated free testosterone (cFT), using smoothed centile plots, linear mixed models and effect size estimates. RESULTS:Median (interquartile range) for serum testosterone was 11.6 (9.4-14.1) nmol/L, SHBG 36.9 (27.9-48.1) nmol/L and cFT 213 (178-255) pmol/L. Age and BMI were inversely associated with testosterone and cFT, while SHBG was associated with age and inversely with BMI (all P < .001). Living with a partner, (South) Asian ethnicity, never or previous smoker and some medical conditions were associated with lower testosterone. Poultry or fish eater, and higher physical activity were associated with higher testosterone (all P < .001). Testosterone was lowered by ~0.5 nmol/L across ages, ~1.5 nmol/L for BMI 30 vs 25 kg/m2 , ~2 nmol/L for (South) Asian ethnicity, living with partner, college/university qualifications, low red meat eater, insufficient physical activity and 0.3-1.0 nmol/L with cardiovascular disease or diabetes. Different combinations of these factors varied serum testosterone by ~4 nmol/L, SHBG by ~30 nmol/L and cFT by ~60 pmol/L. CONCLUSIONS:The identified modifiable risk factors support lifestyle-based interventions in men with low testosterone concentrations. Considering sociodemographic, lifestyle and medical factors facilitates more personalized interpretation of testosterone testing results with respect to existing reference ranges.

journal_name

Clin Endocrinol (Oxf)

journal_title

Clinical endocrinology

authors

Yeap BB,Marriott RJ,Antonio L,Bhasin S,Dobs AS,Dwivedi G,Flicker L,Matsumoto AM,Ohlsson C,Orwoll ES,Raj S,Reid CM,Vanderschueren D,Wittert GA,Wu FCW,Murray K

doi

10.1111/cen.14342

subject

Has Abstract

pub_date

2021-02-01 00:00:00

pages

290-302

issue

2

eissn

0300-0664

issn

1365-2265

journal_volume

94

pub_type

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