Fig. 2

Handwashing Education in Elementary Schools and Reciprocity by Prefecture.

Note: In the figure on the left, percentages of respondents in different prefectures (ranging from Hokkaido to Okinawa) who received handwashing education at their elementary school are depicted on the map of Japan (darker colors indicate schools with regular teacher-supervised handwashing in the given prefecture; range = 0.1─0.38). In the figure on the right, the degree of reciprocity is depicted on the map of Japan (darker colors indicate a higher mean value of reciprocity; range = 0.18─0.70)