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    I have two independent groups: Treatment 1 patients and Treatment 2 patients

    I want to see if the morbidity of surgery between two groups is different

    In group 1

    13 had postop complications
    2 had complications detected preop
    22 had no complications at all

    In group 2
    3 had postop complications
    9 had complications preop
    12 had no complications

    Therefore the surgical morbidity in group 1 is 13/37 and 3/24 in group 2.

    What test could I use to check the difference and would I need to reclassify the groups to 1. preooperative or no complications and 2. postoperative complications?

    Also I just would like someone to verify that a chi-square test was correct in this instance

    In this test I removed preoperative complications from the numbers

    Group 1
    13 postop complications
    22 no complications

    Group 2
    3 postop complications
    12 no complications

    Was I correct is using a chi-square test here?

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