Table 2.

The interaction of SOL and age on NIHSS scores.

Variables	PSOL (>30 min)		NSOL (≤30 min)		MD	p
	Middle-aged (n = 62)	Elderly (n = 91)	Middle-aged (n = 59)	Elderly (n = 68)
	Mean ± SD	Mean ± SD	Mean ± SD	Mean ± SD
NIHSS scores	1.95 ± 0.21	–	1.31 ± 0.23	–	0.64	0.046*
	1.95 ± 0.21	–	–	1.26 ± 0.20	0.69	0.022*
	1.95 ± 0.21	0.90 ± 0.17	–	–	1.05	<0.001***

PSOL, prolonged sleep onset latency; NSOL, normal sleep onset latency; NIHSS, National Institutes of Health Stroke Scale; GLM, general linear models; MD, Mean differences; SD, standard deviation.

GLM was used to calculate the differences in levels between four groups with BMI as the covariate. The simple effect was calculated using GLM. Data were reported as mean ± SD, *p < 0.05, **p < 0.01, ***p < 0.001.