Table II.

κ Coefficients and agreement ratios for interrater and intermethod reliability

	3 minutes	6 minutes	9 minutes	Average
Interrater	0.825 k (AP) 35/42 Cases	0.850 k (AP) 36/42 Cases	0.850 k (AP) 36/42 Cases	0.841 k (AP)
Intermethod (standard mask)	0.549 k (M) 24/42 Cases	0.449 k (M) 20/42 Cases	0.449 k (M) 20/42 Cases	0.482 k (M)
Intermethod (standard plus mark)	0.473 k (M) 21/42 Cases	0.499 k (M) 22/42 Cases	0.398 k (F) 18/42 Cases	0.467 k (M)
Intermethod (cingulate only mask)	0.574 k (M) 25/42 Cases	0.674 k (S) 29/42 Cases	0.574 k (M) 25/42 Cases	0.607 k (S)
Intermethod (standard weighted maska)	0.699 k (S) 30/42 Cases	0.649 k (S) 28/42 Cases	0.624 k (S) 27/42 Cases	0.657 k (S)

F, Fair agreement; M, moderate agreement; S, Substantial agreement; AP, Almost perfect agreement.

^aThe standard weighted mask was constructed to conduct supplementary analyses.