Type of monitor	Number of channels	Sensitivity (%) at threshold AHI of 15	Specificity (%) at threshold AHI of 15	Sensitivity (%) at threshold AHI of 5	Specificity (%) at threshold AHI of 5
II	7 to 16	79 to 100	71 to 100	88 to 94	36 to 77
III	4 to 6	64 to 100	41 to 100	83 to 97	48 to 100
IV	2 or 3	67 to 98	50 to 100	75 to 100	43 to 100