Prevalence, predictors and effects of shift work sleep disorder among nurses in a Nigerian teaching hospital

Table 4 Comparison of sleep parameters between SWSD, No SWSD and non-shift Groups

Variables	Shift group		Non-shift group	p1	p2	p3
Variables	SWSD n = 19	No SWSD n = 25	n = 44	p1	p2	p3
Nocturnal sleep duration^a (Mean ± SD)	5.8 ± 1.4	5.9 ± 1.1	7.2 ± 1.3	0.922	< 0.001	< 0.001
• < 7 h n (%)	11 (57.9)	15 (60.0)	16 (36.4)	0.888	0.113	0.058
• 7–9 h n (%)	8 (42.1)	10 (40.0)	28 (63.6)	0.888	0.113	0.058
Daytime sleep duration^a (Mean ± SD)	2.7 ± 0.8	2.4 ± 0.6	1.0 ± 0.6	0.672	< 0.001	< 0.001
Sleep efficiency^a(Mean ± SD)	75.9 ± 11.7	85.9 ± 9.2	86.3 ± 10.6	0.002	0.001	0.893
ESS score (Mean ± SD)	12.6 ± 2.8	5.3 ± 2.7	6.1 ± 3.8	< 0.001	< 0.001	0.356
• EDS n (%)	17 (89.5)	0 (0)	7 (15.9)	< 0.001 ^F	< 0.001 ^F	< 0.001 ^Y
• No EDS (%)	2 (10.5)	25 (100.0)	37 (84.1)	< 0.001 ^F	< 0.001 ^F	< 0.001 ^Y
ISI score (Mean ± SD)	8.4 ± 3.6	6.6 ± 2.3	5.8 ± 2.5	0.207	0.028	0.453
• Insomnia n (%)	2 (10.5)	0 (0)	0 (0)	0.181^F	0.088^F	–
• No insomnian (%)	17 (89.5)	25 (100.0)	44 (100.0)	0.181^F	0.088^F	–

P1 SWSD vs No SWSD groups; p2 SWSD vs non-shift Groups; p3 No SWSD vs non-shift Groups
SWSD Shift Work Sleep Disorder, ESS Epworth Sleepiness Scale, EDS Excessive daytime sleepiness, ISI Insomnia Severity Index
^aAverage of nocturnal sleep duration over 30 days
FFisher’s exact
YYates corrected
Bold enteries are statistically significant

ISSN: 2398-2683