Patients with no gender will have their gender as something other than 'M' or 'F' in the data set – probably it will be blank. To find them use the gender filter.
- Tick Gender = Other
- Click the 'Recalculate' button
- Click the 'View Pop.' Button
- The Patient report for this filtered group will be displayed and you will see that the sex column is empty or has something other than 'M' or 'F'