Basically the Kansas Governor instituted a mask mandate for the State in July and then the State Legislature cut the legs out from under the Governor's authority to issue such a mandate state wide and essentially left it up to individual counties to decide for themselves.
Of the approximately 105 counties in Kansas, 20 of them did institute a Mask Mandate and the other 80+ did not institute a mask mandate. This set up a natural experiment over the course of the last 3 months to see whether or not Mask Mandates play a role in helping mitigate the number of COVID-19 cases in those Mask Mandated counties.
University of Kansas Mask Study Shows significant Differences in Kansas Counties with vs. without Mask Mandates
KU study concludes county mask mandates in Kansas have stalled major rise in COVID-19
Probably a better explanation of the study here (Graphic Data from the counties shown)...
ADDENDUM (10/28/2020 8:45PM):
Vanderbilt University School of Medicine study shows correlation between hospitalizations and mask mandates.
Of the approximately 105 counties in Kansas, 20 of them did institute a Mask Mandate and the other 80+ did not institute a mask mandate. This set up a natural experiment over the course of the last 3 months to see whether or not Mask Mandates play a role in helping mitigate the number of COVID-19 cases in those Mask Mandated counties.
University of Kansas Mask Study Shows significant Differences in Kansas Counties with vs. without Mask Mandates
KU study concludes county mask mandates in Kansas have stalled major rise in COVID-19
Probably a better explanation of the study here (Graphic Data from the counties shown)...
ADDENDUM (10/28/2020 8:45PM):
Vanderbilt University School of Medicine study shows correlation between hospitalizations and mask mandates.