The Claim
In Chinese men aged 40–69, calculated free testosterone levels decline annually by 1.06–2.71 pmol/L with aging, and the prevalence of androgen deficiency increases progressively from 1.2% to 61.6% across age groups.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
In Chinese men between 40 and 69 years old, free testosterone levels decrease by 1.06 to 2.71 pmol/L each year as they age, and the percentage of men with androgen deficiency rises from 1.2% to 61.6% across these age groups.
See the scientific wording
In Chinese men aged 40–69, calculated free testosterone (cFT) levels decline annually by 1.06–2.71 pmol/L with aging, and prevalence of androgen deficiency rises progressively from 1.2% to 61.6% across age groups, suggesting a strong association between aging and declining bioavailable testosterone.
As men age, the testes produce less testosterone, and the liver makes more of a protein that binds testosterone tightly, leaving less free hormone available for the body to use.
What the research says
1 studyAs Chinese men get older between 40 and 70, the amount of active testosterone in their blood slowly goes down, and more of them end up with dangerously low levels — up to over 60% in the oldest group. The study measured this directly and found the same pattern.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.