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Secular trend in reported sperm counts

W H James

    Andrologia
    |July 1, 1980
    PubMed
    Summary

    Recent studies suggest a decline in sperm counts, but this has been debated. This research analyzed 29 data sets over 45 years, finding a significant decrease in sperm counts, indicating a likely secular trend.

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    Area of Science:

    • Reproductive Health
    • Environmental Medicine
    • Epidemiology

    Background:

    • Debate exists regarding a secular decline in human sperm counts.
    • Previous arguments relied on limited, geographically diverse data.
    • Statistical significance of sample differences is acknowledged, but causality is disputed.

    Purpose of the Study:

    • To investigate the trend of mean sperm counts in unselected men over the past 45 years.
    • To address the dispute regarding a potential secular decline in sperm counts.
    • To identify representative data on sperm counts across different time periods.

    Main Methods:

    • Systematic review and meta-analysis of published data.
    • Identification of 29 representative mean sperm counts from unselected men.
    • Analysis of data spanning approximately 45 years, focusing on publication time.

    Main Results:

    • A statistically significant decline in reported mean sperm counts was observed over time, particularly since 1960.
    • The data included 29 distinct mean sperm counts from representative samples.
    • The observed trend suggests a consistent decrease across multiple studies.

    Conclusions:

    • The findings provide strong evidence for a secular decline in sperm counts in some populations.
    • Artifacts alone are unlikely to explain the observed trend.
    • The results support the hypothesis of a real, time-dependent decrease in male fertility indicators.

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