“…For sleep stages W, N1, N2, N3, and R, Duce et al (2014) report intrarater agreement with Cohen's kappa values of 0.87, 0.51, 0.66, 0.60, and 0.92 for two raters. Somaskandhan et al (2023) report intrarater percent agreement of 89-90, 44-63, 77-81, 92-93, and 93-93 for two raters.…”