Testosterone, sex hormone-binding globulin and the metabolic syndrome: A systematic review and meta-analysis of observational studies
Open accessAbstract
BACKGROUND: Accumulating evidence suggests a sex-dependent role of circulating testosterone in the metabolic syndrome (MetS). METHODS: We conducted a meta-analysis of observational studies (PubMed and EMBASE-1 May 2010) relating MetS to determinants of testosterone status [total testosterone (TT), free testosterone (FT) and sex hormone-binding globulin (SHBG)]. RESULTS: A total of 52 studies were identified, comprising 22 043 men and 7839 women and presenting relative risk (RR) estimates or hormone levels for subjects with and without MetS. Endogenous TT and FT levels were lower in men with MetS [TT mean difference = -2.64 nmol/l, 95% confidence interval (CI) -2.95 to -2.32; FT standardized mean difference = -0.26 pmol/l, 95% CI -0.39 to -0.13] and higher in women with MetS (TT mean difference = 0.14 nmol/l, 95% CI 0.07-0.20; FT standardized mean difference = 0.52 pmol/l, 95% CI 0.33-0.71) compared with those without. Similarly, men with higher TT levels had a lower MetS risk (RR estimate = 0.38, 95% CI 0.28-0.50) whereas higher TT levels increased the risk of MetS in women (RR estimate = 1.68, 95% CI 1.15-2.45). In both sexes, higher SHBG levels were associated with a reduced risk (men: RR estimate = 0.29, 95% CI 0.21-0.41; women: RR estimate = 0.30, 95% CI 0.21-0.42). CONCLUSION: This meta-analysis supports the presence of a sex-dependent association between testosterone and MetS: TT and FT levels are lower in men with MetS, whereas they are higher in women with MetS. There are no indications for a sex-specific association between SHBG and MetS. In both men and women, MetS is associated with lower SHBG levels.
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Numerous estimating equations have been described, including bioavailable testosterone, free androgen index, and free testosterone index (Vermeulen method), with results suggesting high correlations with direct assays.
“Numerous estimating equations have been described in the literature including bioavailable T (non-SHBG bound T), free androgen index (FAI; 100T/SHBG), and free T index (Vermeulen method), among others, with results suggesting high correlations to direct assays.”
From Challenges in Testosterone Measurement, Data Interpretation, and Methodological Appraisal of Interventional Trials (2016) · cites this paper as [103]
In the largest study evaluating predictive accuracy of free testosterone calculations, Sartorius and colleagues concluded that empirical methods (Ly, Sartorius) are most concordant, while other estimations (Vermeulen, Nanjee and Wheeler, Sodergard) overestimate the true value.
“In the largest study evaluating predictive accuracy of fT calculations, Sartorius and colleagues concluded that empirical methods (Ly, Sartorius) of calculated fT are most concordant, with other estimations (Vermeulen, Nanjee and Wheeler, Sodergard) resulting in overestimation of the true value.”
From Challenges in Testosterone Measurement, Data Interpretation, and Methodological Appraisal of Interventional Trials (2016) · cites this paper as [103]
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Boehm, U., Bouloux, P.-M., Dattani, M. T., de Roux, N., Dodé, C., Dunkel, L., Dwyer, A. A., Giacobini, P., Hardelin, J.-P., Juul, A., et al. (2015) · Nature Reviews Endocrinology · doi:10.1038/nrendo.2015.112 · Cited by 874 · see citing works
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“While this study was limited to male participants, a low SHBG has also been shown to be associated with obesity [77,78], insulin resistance [78,79], and the metabolic syndrome in women [80].”
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- Authors
- Brand, J. S., van der Tweel, I., Grobbee, D. E., Emmelot-Vonk, M. H., & van der Schouw, Y. T.
- Affiliations
- University Medical Center Utrecht (NL)
- Venue
- International Journal of Epidemiology
- Publisher
- Oxford University Press (OUP)
- Published
- 2010-09-24
- Volume
- 40
- Issue
- 1
- Pages
- 189-207
- ISSN
- 0300-5771 (ISSN-L)
- 1464-3685
- OpenAlex
- W2116785242
- Cited by
- 334
- References
- 119
- Citations by year
- 2026: 9 · 2025: 12 · 2024: 20 · 2023: 22 · 2022: 9 · 2021: 21 · 2020: 20 · 2019: 22 · 2018: 23 · 2017: 23 · 2016: 22 · 2015: 30 · 2014: 22 · 2013: 31 · 2012: 24
- FWCI
- 3.55
- Type
- journal article
- Language
- en
- Open access
- green
- hal.science
- Licence
- other-oa
- Locations
- International Journal of Epidemiology (publishedVersion)
- PubMed (publishedVersion)
- HAL (submittedVersion, other-oa)
- HighWire Press Open Archive (submittedVersion)
- Trinity's Access to Research Output (TARA) (Trinity College Dublin) (submittedVersion)
- Topics
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Hormonal and reproductive studies
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes, Cardiovascular Risks, and Lipoproteins
- Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
- Keywords
- testosterone, sex hormone-binding globulin, metabolic syndrome, free testosterone, sex differences, men, women, androgen status
- MeSH terms
- Female, Humans, Male, Sex Factors, Sex Hormone-Binding Globulin, Testosterone, Metabolic Syndrome
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
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