Percent anti-vaccine tweets January, 2009

Percent anti-vaccine tweets

0.4+
0.35 - 0.4
0.3 - 0.35
0.25 - 0.3
0.2 - 0.25
0.15 - 0.2
0.1 - 0.15
0

Percentage of anti-vaccine tweets was calculated by dividing the number of anti-vaccine tweets by total number of autism and vaccine-related tweets per micropolitan/metropolitan area.