Reliability of Sawai’s classification for dental cervical abrasions: A pilot study

Table 2 MS photography based evaluation and SC photography Crosstab

		SC photography								Total	Measure of agreement, χ value
		Class A			Class B			Class C
		Type I	Type II	Type III	Type I	Type II	Type III	Type I	Type II
MS Photography based evaluation	Class A Type I	12	0	0	0	0	0	0	0	12	0.899
	Class A Type II	0	11	0	0	0	0	2	0	13
	Class A Type III	0	0	3	0	0	0	0	1	4
	Class B Type I	0	0	0	2	0	0	0	0	2
	Class B Type II	0	0	0	0	8	0	1	0	9
	Class B Type III	0	0	0	0	0	6	1	0	7
	Class C Type II	1	0	0	0	0	0	7	0	8
	Class C Type III	0	0	0	0	0	0	0	15	15
Total		13	11	3	2	8	6	11	16	70