The U.S. Centers for Disease Control and Prevention (CDC) released this data, September 11, on 314 people with and without COVID-19 and their use of masks 14 days before the onset of illness. The numbers are about the same for each group.
People with virus:
Never: 6
Rarely: 6
Sometimes: 11
Often: 22
Always: 108
People without virus:
Never: 5
Rarely: 6
Sometimes: 7
Often: 23
Always: 118
Source: CDC, Morbidity and Mortality Weekly Report, Vol 69, No. 36, September 11, 2020