I have a relatively small data set of 135 subjects. These are categorized in two dichotomous variable, type of health care and sex. I can use a Fisher's Exact test to determine if sex is significantly related to the type of care, but also want to generate a confidence interval for the difference in proportions. In this particular sample, 6 of 85 patients (7%) with good care were female and 11 of 50 (22%) patients with poor care were female. The observed difference in proportions was 15% (22% - 7%). How do I calculate the confidence interval for this difference? A formula would be great. The SPSS tool to get it would be fantastic.

Gary

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