Development of a prediction model for facilitating the clinical application of transcranial color-coded duplex ultrasonography

Table 1 Baseline characteristics

Variables	Total (n = 301)	Impenetrable temporal window (n = 168)	Penetrable temporal window (n = 133)	P
Sex, n (%)				< 0.001
Female	181 (60)	103 (77)	78 (46)
Male	120 (40)	30 (23)	90 (54)
Age, Mean ± SD(year)	67.5 ± 8.50	68.8 ± 8.68	66.46 ± 8.23	0.018
Thickness, Median (Q1,Q3)(cm)	1.02 (0.94, 1.08)	1.08 (1.06, 1.12)	0.97 (0.90, 1.02)	< 0.001

Note: Univariate analysis showed that sex, age and skull thickness were statistically correlated with the ultrasound penetrativity (P < 0.05). Impenetrable was defined as no signal being detected from any of the cerebral arteries. Penetrable was defined as successful display of any one of the cerebral arteries. Thickness was measured in centimeters at the thinnest part of the skull at the temporal window

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