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Related Experiment Videos

Study of cancer mortality by grid square method.

T Okubo

    Environmental Health Perspectives
    |October 1, 1979
    PubMed
    Summary

    The grid square method revealed distinct geographical cancer mortality patterns in Tokyo. Stomach cancer linked to blue-collar areas, while lung cancer affected white-collar areas, highlighting spatial disparities.

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    Area of Science:

    • Epidemiology
    • Geographic Information Systems (GIS)

    Background:

    • Standardized government grid square method in Japan uses latitude and longitude lines.
    • Basic unit area is approximately one square kilometer.
    • Cancer mortality geographical distribution analysis is crucial for public health.

    Purpose of the Study:

    • To evaluate the grid square method for analyzing cancer mortality geographical distribution.
    • To identify spatial patterns of stomach and lung cancer mortality in Tokyo.

    Main Methods:

    • Utilized the standardized grid square method in Tokyo over six years.
    • Employed a moving average of nine grid squares and a population density-based combined grid square method for statistical analysis.
    • X-Y coordinates facilitated computer mapping and spatial analysis.

    Main Results:

    • Clear geographical distributions were observed for stomach and lung cancers.
    • High stomach cancer mortality areas were similar for males and females, correlating with blue-collar districts.
    • High lung cancer mortality areas, also similar for both sexes, correlated with white-collar districts.

    Conclusions:

    • The grid square method offers advantages over political boundaries for spatial analysis.
    • It enables precise computer mapping, distribution center calculation, and contour line determination.
    • This method facilitates statistical analysis and spatial interpolation of health data.

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