Table 3.

Tests for Slope Variability in Design Effect Model for a) PVT Lapses, b) PVT Speed, c) MWT Sleep Onset Latency, and d) SSS Score

Model	Random parameter	d.f.	AIC	log Lik	Test	L. ratio	P-value
a) lapses
1	Intercept	12	1390.80	−683.40
2	RESTRICT	14	1391.66	−681.83	1 vs. 2	3.13	0.21
3	RESTRICT and TRANS	17	1361.24	−663.62	2 vs. 3	36.43	0.00
4	RESTRICT, TRANS and RECOV	21	1355.82	−656.91	3 vs. 4	13.42	0.01
b) speed
1	Intercept	12	107.27	−41.63
2	RESTRICT	14	105.89	−38.95	1 vs. 2	5.38	0.07
3	RESTRICT and TRANS	17	102.68	−34.34	2 vs. 3	9.21	0.03
4	RESTRICT, TRANS and RECOV	—	—	—	—	—	—
c) sleep onset latency
1	Intercept	12	1570.67	−773.33
2	RESTRICT	14	1574.67	−773.33	1 vs. 2	0.0005	0.10
3	RESTRICT and TRANS	17	1565.67	−765.83	2 vs. 3	15.00	0.002
4	RESTRICT, TRANS and RECOV	21	1567.05	−762.53	3 vs. 4	6.62	0.16
d) SSS
1	Intercept	12	718.22	−347.11
2	RESTRICT	14	719.43	−345.72	1 vs. 2	2.79	0.25
3	RESTRICT and TRANS	17	715.45	−340.72	2 vs. 3	9.96	0.02
4	RESTRICT, TRANS and RECOV	21	719.74	−338.87	3 vs. 4	3.71	0.45

Abbreviations: RESTRICT = Sleep Restriction slope; TRANS = recovery Transition parameter; RECOV = recovery slope