Measuring Swatch Gauge

I’m knitting the Kristan Cap Sleeve Tee by Joan McGowan-Michael. The Gauge states 16 sts and 24 rows per 4 inches over stitch Pattern B which has yarn overs in it. My question is do I count the yarn over space as a stitch or just the stitches themselves? I am a bit confused.
Thanks for your help

Since a YO makes a stitch, you count it.

Thank you for your help - I counted 19 stitches instead of 16 over the four inches - I will try again - Thanks again I really appreciated your help