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

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