Table 2. Polysomnographic (PSG) monitoring results for the CPI group.

	Time of Insomnia (years)	Percent sleep efficiency (% SE)	Latency of sleep (min)	Latency of REM (min)	Duration of REM (min)	Ratio of REM (%)
Sub1	6	54.1	18	275	10.5	3.2
Sub2	20	76.6	34	95	55.5	13.5
Sub3	1.5	62.8	43	92.5	17	4.8
Sub4	3	69.4	52.5	100	34.5	8.8
Sub5	3	73.2	60	75	64.5	16.1
Sub6	1	77.8	42.5	90	67.5	15
Sub7	10	65.1	2.5	91	36	9.9
Sub8	3	86.9	13.5	110.5	57	12.8
Sub9	2	77.5	1.5	105.5	81	18.1
Sub10	10	57.8	16	125	58	18.4
Sub11	6	87	11	29.5	168.5	32.4
Sub12	10	68.8	33	201	75.5	22.4
Sub13	7	-	37.2	21.2	114.5	23.3
Sub14	3	72.2	26.5	59	105.5	26.8
Sub15	3	58.4	10.5	141	53	16.2
Sub16	7	65.8	10	65.6	75.5	23.6
Sub17	6	89.4	19	85	80.5	17.5
Sub18	6	81.9	29	262	70.5	16.1
Sub19	5	-	66	60	68	16.4
Sub20	14	87.9	6.5	60.5	73	16.4
Sub21	2	69.3	8.5	67.5	21.5	5.8

REM, Rapid-eye movement.