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    This meta-analysis confirms a link between aging and DNA damage in humans. Factors like smoking and sample type significantly influence this relationship, while sex does not.

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    Area of Science:

    • Gerontology
    • Molecular Biology
    • Genetics

    Background:

    • DNA damage is a proposed mechanism underlying the aging process.
    • Existing research on age-related DNA damage in humans presents inconsistent findings.
    • Understanding this relationship and its influencing factors is crucial for aging research.

    Purpose of the Study:

    • To conduct a meta-analysis to clarify the association between age and DNA damage in humans.
    • To identify potential moderator variables that influence age-related DNA damage.

    Main Methods:

    • A systematic search of electronic databases and bibliographies for studies published since 2004.
    • Meta-analysis using a random-effects model to calculate summary odds ratios and confidence intervals.
    • Inclusion of 76 correlations from 36 studies involving 4676 participants.

    Main Results:

    • A statistically significant positive correlation was found between age and DNA damage (r=0.230, p=0.000).
    • High heterogeneity among study results was observed (Q (75)=1754.831, p=0.000).
    • Smoking habits, analytical technique, and tissue/sample type were identified as significant moderators (p=0.026, p=0.000, p=0.000).
    • Sex was not found to be a significant moderator (p=0.114).

    Conclusions:

    • This meta-analysis provides evidence for an association between aging and DNA damage in humans.
    • Smoking status, the methodology employed, and the biological sample analyzed are key factors modulating age-related DNA damage.
    • Further research may benefit from considering these identified moderator variables.