⁴  In this particular case, the estimates of \(\tau \), \(\tau ^{2}\), and \(I^{2}\) will fall outside of the 95% CI for unknown reasons (though the summary proportion will not). The original authors did not discover this issue. One way to address this issue is by switching to the 99% CI. However, for the sake of consistency, we will continue to use the 95% CI throughout this tutorial.