Regarding getting confidence intervals for Cohen's d (and the unbiased version, called Hedges' g), I recommend the following articles and the references within: Cohen's D statistic in SAS - The DO Loop Confidence intervals for Cohen's d statistic in SAS - The DO Loop ... View more

For the history and context of the OP's problem, see the previous thread: https://communities.sas.com/t5/Statistical-Procedures/Easy-way-to-calculate-Cohen-s-d/m-p/801157  ... View more