I am doing a systematic review on cochlear implantation and how it affect for ex: Spatial localization. The special case is that there are no control groups. The evaluation has been done for the same group but pre and post test. I tried RevMan from Cochrane but it require the sample size of the control group which is the same as the experimental group.
My question is how to calculate the I2 value for heterogeneity in this case? What other software you can recommend?
Thank you!