Journal of Circadian Rhythms

Table 1 Classification of DSPD cases

From: Delayed sleep phase cases and controls

	Number	Percent	Cumulative Percent
1 Absolutely Certain	72	35.1	35.1
2 Fairly Certain	69	33.7	68.8
3 Questionable	44	21.5	90.2
4 Unlikely	16	7.8	98.0
5 Very Doubtful	4	2.0	100.0
TOTAL	205	100.0

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