Fig. 2

The average monthly wages for each of the eight groups. The average monthly wage among the 345 general hospitals was 351,199.3 Japanese yen. The monthly residents’ wage in the most populated city was 305,635.1 Japanese yen and was significantly lower than in other cities (< 100,000, < 200,000, < 300,000, < 400,000, and < 600,000). The broken line shows this average number. The box plot shows standard error. *p < 0.05 in Tukey’s test