Table 4.

Kappa values for inter- and intraobserver variation for the Charalambous classification (eight categories plus ‘could not classify’ as a category and using first analysis approach Cohen's Kappa).

	Interobserver					Intraobserver
	Rater 1	Rater 2	Rater 3	Rater 4	Rater 5
Rater 1		0.50	0.47	0.31	0.43	0.53
Rater 2			0.38	0.40	0.42	0.44
Rater 3				0.27	0.47	0.32
Rater 4					0.50	0.61
Rater 5						0.54
Mean ĸ value for each observer	0.43	0.43	0.40	0.37	0.46
Mean ĸ value for all observers	0.42					0.49