Table 1.

Participant characteristics

Variable	No incentives, n = 12	Incentives, n = 12
Men, no.	5	7
Age, y	20.3 (1.6)	20.1 (0.9)
ESS score33	8.6 (2.8)	6.7 (3.8)
MEQ score34	49.4 (5.0)	51.1 (5.4)
BAI score35	2.7 (2.1)	2.3 (2.3)
BDI-II score36	4.3 (4.4)	4.5 (4.6)

Data are presented as mean (SD), except sex, which is a number. ESS refers to Epworth Sleepiness Scale; MEQ, Morning-Eveningness Questionnaire; BAI, Beck Anxiety Inventory; BDI, Beck Depression Inventory.