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Thread: correlation between estimation of gestational age during pregnancy by diffl methods

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    Unhappy correlation between estimation of gestational age during pregnancy by diffl methods




    what statistical test should be used for finding correlation between gestational age estimated from clinical method and that from ultrasound during pregnancy.
    for eg: a mother at 36 week of gestation undergoes clinical examination and her gestational age is approximately 34 week ( symphysiofundal hieght is 34cm) and gestational age from ultrasound shows 35 week 4 days.
    i have 50 such data from preg women undergoing clinical evaluation and usg at 36 weeks.
    please reply urgently

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    Re: correlation between estimation of gestational age during pregnancy by diffl metho

    If normally distributed Pearson coefficient otherwise spearman rank correlation.

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    Re: correlation between estimation of gestational age during pregnancy by diffl metho

    sir am a novice to statistics.. am putting down 10 values... say all 10 women underwent scan at 36 wk of gestation...
    clinical gestational age usg gestational age
    34wk 34w 6day
    35wk 34w 2day
    35wk 34w 5day
    33wk 34w 2day
    34wk 33w 6day
    36wk 35w 4day
    34wk 34w 5day
    35wk 34w 4day
    33wk 33w 5day
    34wk 35w 3day

    now how do i find a correlation between these values...

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    Re: correlation between estimation of gestational age during pregnancy by diffl metho

    You might want to convert both into days and plot two histograms to look at their distributions.

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    Re: correlation between estimation of gestational age during pregnancy by diffl metho

    maybe a quick remark: I would do a scatterplot first, and if the realtionship is nonlinear do the Spearman anyway.
    Last edited by rogojel; 09-21-2015 at 07:24 AM. Reason: typo

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    Re: correlation between estimation of gestational age during pregnancy by diffl metho

    You might want to consider using a Bland-Altman plot. https://en.wikipedia.org/wiki/Bland%E2%80%93Altman_plot

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    Re: correlation between estimation of gestational age during pregnancy by diffl metho


    Will symphysiofundal height always be gestational age as weeks (with no days)? You may eventually run two correlations, one with values as days and one with values rounded to weeks and see how these look. Since one will always be more specific than the other.

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