Creating Shaded Region on bar chart

Hi everyone, I’m having some trouble finding a tutorial on how to shade only a certain region of a plot. The plot I would like to create would have z scores (positive and negative), and need a shaded region from 1.65 to -1.65 which would indicate the normal score range, and that anything outside of this range is considered dysfunctional. Could you please steer me into the correct direction? I’ve seen this done on graphs on the website, but cannot seem to figure out how to do it myself. Thank you very much for your time.