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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.

Acceptability of radiographs of lower molars.
Radiographer 2
Unacceptable Acceptable Total
Radiographer1 Unacceptable 31 33 64
Acceptable 19 158 177
Total 50 191 241

Answer

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.

Acceptability of radiographs of upper incisors
Radiographer 2
Unacceptable Acceptable Total
Radiographer 1 Unacceptable 230 13 243
Acceptable 65 79 144
Total 295 92 387

Answer