Exercises: Diagnostic consistency
Question 10.1
Two radiographers were comparing whether or not they agreed on the diagnostic quality of radiographs produced on a particular system. They rated each radiograph as either acceptable or unacceptable for diagnosing problems with various categories of tooth (the reasons for unacceptability varied). The results for lower molars are shown in below. Calculate and interpret κ.
Radiographer 2 | ||||
Unacceptable | Acceptable | Total | ||
Radiographer1 | Unacceptable | 31 | 33 | 64 |
Acceptable | 19 | 158 | 177 | |
Total | 50 | 191 | 241 |
Question 10.2
Two radiographers were comparing whether or not they agreed on the diagnostic quality of radiographs produced on a particular system. They rated each radiograph as either acceptable or unacceptable for diagnosing problems with various categories of tooth (the reasons for unacceptability varied). The results for upper incisors are shown below. Calculate and interpret κ.
Radiographer 2 | ||||
Unacceptable | Acceptable | Total | ||
Radiographer 1 | Unacceptable | 230 | 13 | 243 |
Acceptable | 65 | 79 | 144 | |
Total | 295 | 92 | 387 |