T-Test Ever had a malpractice claim filed? Physician gender No claims Had claim filed Group Statistics N Mean Std. Deviation Std. Error Mean 571 .19 389 .016 393 .07 .262 .013 Physician gender Equal variances assumed Equal variances not assumed Independent Samples Test Levene's Test for Equality of Variances t-test for Equality of Means 95% Confidence Interval of the Significance F Sig. t df One-Sided p Two-Sided p Mean Difference Std. Error Difference Difference Lower Upper 114.575 Independent Samples Effect Sizes 95% Confidence Interval Standardizer Point Estimate Lower Upper Physician gender Cohen's d .343 .326 .197 .455 Hedges' correction .343 .326 .197 .455 Glass's delta .262 .427 .295 .559 a. The denominator used in estimating the effect sizes. Cohen's d uses the pooled standard deviation. Hedges' correction uses the pooled standard deviation, plus a correction factor. Glass's delta uses the sample standard deviation of the control group.