Any national study cited is OF NO CONCERN to me. The population differences in the variables of cyclists using sidewalks and incurring injury is such a small representation and GEOGRAPHICALLY RESTRAINED to high population areas. Nobody uses these sidewalks, use google maps and count the pedestrians on MLK in Beaumont. Do Times Square in NYC. It's common sense, and the fact that you can't stop your eyes from glazing over when you see a study is a whole different problem.
I can observe that sidewalk riding is more safe on MLK blvd in Beaumont and Gulfway Dr in Port Arthur Texas, and my commute when available. Once again, this is so simple it's stupid. How many close calls have you had on a sidewalk? On the Road?
So simple.