Table 3.

Interrater Agreement - Kappa statistics

	Kappa	Agreement	Expected Agreement
Panel A: Unweighted Kappa statistic
SAH vs. IAH	0.128**	33.0%	23.2%
SAH vs. PAH	0.095**	37.3%	30.7%
PAH vs. IAH	0.085**	34.8%	28.8%
Panel B: Weighted Kappa statistic
SAH vs. IAH	0.271**	77.9%	69.7%
SAH vs. PAH	0.176**	80.3%	76.1%
PAH vs. IAH	0.154**	78.7%	74.9%

Notes: The weighted kappa is based on the following weights: 1-{|i-j|/(k-1)], where i and j indicate the rows and columns of the ratings by the two raters and k is the number of possible ratings. The following interpretation of Kappa statistics is commonly used (Landis and Koch, 1977): 0.00-0.20=slight; 0.21-0.40=fair; 0.41-0.60=moderate; 0.61-0.80=substantial; and 0.81-1.0=almost perfect

^**p <0.01