Table 3.

Mean and standard deviation of sleepiness in seven repeated measures in two work shifts.

	Night shift	Day shift	P value‡
Sleepiness 1	1.67 ± 0.89	3.07 ± 1.78	<0.001
Sleepiness 2	1.88 ± 0.86	2.57 ± 1.45	0.001
Sleepiness 3	2.19 ± 1.28	2.34 ± 1.19	0.521
Sleepiness 4	3.36 ± 1.38	2.54 ± 1.59	0.001
Sleepiness 5	4.46 ± 1.82	3 ± 1.41	<0.001
Sleepiness 6	5.15 ± 2.08	1.95 ± 0.92	<0.001
Sleepiness 7	5.05 ± 2.27	2.09 ± 1.16	<0.001
P value†	<0.001	<0.001

^‡ t-test.

^† repeated measure for ANOVA.