Based on these groupings, I would think the first two categories were more apt to be the ones that hit Vegas on day one and the lower categories less likely. Hence what we see. 1 - Never stayed home. Never wore a mask, etc. 2 - Went out some, tried to social distance but really did not worry about it 3 - Went out very little, always wore a mask. 4 - Has almost never been out and wore a mask when they did.