Table 2.

Agreement between readers (inter-rater variability) for qualitative data.

	A.S. vs. C.L.	A.S. vs. R.M.	C.L. vs. R.M.
First reading
Cohen’s kappa	0.64 (0.26 to 1.00)	0.16 (−0.22 to 0.54)	0.20 (−0.22 to 0.61)
Gwet’s AC1	0.94 (0.87 to 1.00)	0.86 (0.75 to 0.97)	0.88 (0.79 to 0.98)
Second reading
Cohen’s kappa	0.73 (0.38 to 1.00)	0.46 (0.02 to 0.91)	0.46 (0.02 to 0.91)
Gwet’s AC1	0.96 (0.91 to 1.00)	0.92 (0.84 to 1.00)	0.92 (0.84 to 1.00)