Table 3.

Kappa Statistics for Agreement Between Somfit Algorithm and Consensus PSG Hypnogram – Five Sleep Stages (N1-N2-N3-REM-Wake)

Center (No. Studies)	Kappa – Mean (SE)
	Sleep Study Based F (P) = 0.85(0.43) *	Pooled Confusion Matrix
1 (40)	0.650 (0.017)	0.672 (0.003)
2 (33)	0.637 (0.019)	0.655 (0.003)
3 (33)	0.676 (0.020)	0.689 (0.003)
Total (106)	0.654 (0.013)	0.672 (0.002)

Notes: *F and P-values for ANOVA tests between the three centers.