Reference Ranges and Association of Age and Lifestyle Characteristics with Testosterone, Sex Hormone Binding Globulin, and Luteinizing Hormone among 1166 Western Chinese Men.

PLoS One · 2016 · PMC5053410 · PMID 27711240

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a clear trendno p-value reported

Despite the lack of a clear trend in the associations and predictive ability of total versus free testosterone, evidence from Asian populations does appear to be consistent in identifying that free testosterone, but not total testosterone, has a significant inverse association with age [ 4 , 21 , 22 ]; this is also consistent with the present study.

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