Figure 3

Relationship between number of preparation errors and rate of inspection errors in the single and double similarity class. In the single similarity class, the numbers of preparation errors in the error type (a), (b), (c) were 242, 74, 22, and the rates of inspection errors in the same error type were 10.7% (26/242), 14.9% (11/74), 27.3% (6/22), respectively. In the double similarity class, the numbers of preparation errors in error types (d), (e), (f) were 163, 49, 16, and the rates of inspection errors were 6.7% (11/163), 14.3% (7/49), 25.0% (4/16), respectively. The bar and symbol represent the number of preparation errors and the rate of inspection errors, respectively. The differences in the rates of inspection errors were analyzed among three error types (a) - (c) in the single similarity class and another three error types (d) - (f) in the double similarity class. There were significant differences in the rates of inspection errors between error type (a) and (c) in the single similarity class, between error type (d) and (f) in the double similarity class (P < 0.05). The data were analyzed with a Ryan test. P values of <0.05 were considered to be statistically significant.