Table 2
Agreement between methods A and B on measurements with four-category results

Method A	Method B				Total
	Definite	Probable	Possible	Absent
	Definite	a (1.0)	b (0.75)	c (0.5)		d (0.0)	A1
Probable	e (0.75)	f (1.0)	g (0.75)	h (0.5 or 0)	A2
Possible	i (0.5)	j (0.75)	k (1.0)	l (0.75 or 0)	A3
Absent	m (0.0)	n (0.5 or 0)	o (0.75 or 0)	p (1.0)	A4
Total	B1	B2	B3	B4	N

Number in parentheses indicates the weight used for calculation of the weighted kappa.