Table 4.

Effect of intervention shift schedule on psychomotor vigilance task, fatigue, and sleep mattress sensor sensation during the two-week observation.

	Shift Type	Control		Intervention		Condition		Shift Type		Interaction
		Marginal Mean	SEM	Marginal Mean	SEM	F	p	F	p	F	p
PVT (N = 29)
Δ Mean RRT	Day shift	−0.33	0.09	−0.38	0.09	3.284	0.073	1.113	0.332	1.670	0.193
	Evening shift	−0.26	0.09	−0.29	0.09
	Night shift	−0.24	0.10	−0.52	0.10
Δ Lapse	Day shift	0.84	0.32	0.83	0.33	1.415	0.237	2.254	0.110	1.207	0.303
(SQRT)	Evening shift	0.89	0.33	1.00	0.36
	Night shift	1.01	0.37	1.82	0.37
Sleep mattress (N = 29)
Δ TST (hr)	Day shift	−0.05	0.51	0.12	0.51	0.109	0.742	1.095	0.352	.221	0.882
	Evening shift	−0.27	0.57	−0.55	0.55
	Night shift	−0.83	0.56	−0.28	0.60
	Day off	0.18	0.50	0.25	0.52
Δ SL (min)	Day shift	0.66	2.66	5.13	2.65	0.239	0.625	1.908	0.131	.612	0.608
	Evening shift	1.87	2.95	1.52	2.84
	Night shift	−0.55	2.90	0.45	3.08
	Day off	−1.62	2.62	−2.99	2.69
Δ SE (%)	Day shift	−1.24	1.30	−1.36	1.30	0.690	0.408	1.072	0.363	0.163	0.921
	Evening shift	−2.92	1.46	−1.64	1.40
	Night shift	−1.48	1.43	−0.03	1.53
	Day off	−0.41	1.29	0.20	1.32
ΔWASO (min)	Day shift	−2.04	7.80	0.50	7.80	0.510	0.476	1.270	0.287	0.810	0.490
	Evening shift	8.42	8.61	0.64	8.29
	Night shift	3.65	8.48	18.20	8.96
	Day off	−4.27	7.72	1.92	7.91

Note: PVT = psychomotor vigilance task, RRT = reciprocal response time, SQRT = square root, TST = total sleep time, SL = sleep latency, SE = sleep efficiency, and WASO = wake after sleep onset.