Table 3.

Participants' subjective measures

Condition	No incentive		Incentive
	Normal sleep	TSD	Normal sleep	TSD
Estimated % of correct responsesI**S**	86.1 (6.9)	68.1 (20.8)	94.7 (4.4)	85.6 (11.8)
Certainty of the % of estimated correct responsesI*S**	8.0 (1.3)	6.8 (1.7)	8.9 (1.0)	7.9 (1.4)
Effort for task performanceI*S*I×S#	8.5 (1.4)	7.3 (1.7)	8.9 (0.8)	8.8 (0.8)
(Estimated – real) % of correct responses	−4.4 (7.5)	−15.0 (21.5)	−2.7 (4.3)	−9.0 (10.3)

Data are presented as mean (SD). TSD refers to total sleep deprivation; I, incentives; S, sleep condition.

^**P < 0.01 main and interactive effects of 2-factor (I × S) analysis of variances;

^*P < 0.05;

^#P < 0.10