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    Jun 30, 2011, 02:24 AM
    What stat test should be used to compare two groups before & after treatment?
    Two groups containing 20 patients each: Group A was treated with a surgical technique and group B was the control group. A measurement (outcome score) was taken before treatment and again 6 months later.

    What is the appropriate statistical test I should use to determine if the new surgical treatment made a significant difference in outcome scores between the two groups.

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