[Retracted] Diagnosis and Etiological Analysis of Gastroesophageal Reflux Disease by Gastric Filling Ultrasound and GerdQ Scale

Table 4

ROC curve analysis of the four detection methods.

Test result variable	AUC	Standard error		95% confidence interval		Cutoff	Youden’ index	Sensitivity	Specificity
				Lower limiting value	Higher limiting value
His angel	0.957	0.019	<0.001	0.920	0.993	58.135	0.856	93.50	92.10
Length of abdominal esophagus	0.861	0.038	<0.001	0.787	0.934	3.295	0.616	98.40	63.20
Ultrasonic combination parameter	0.996	0.005	<0.001	0.987	1.000	−4.4070	0.984	98.40	100.00
GerdQ score	0.931	0.025	<0.001	0.882	0.980	7.31	0.824	90.30	92.10

Note. The parameters of ultrasonic combination are His angle and abdominal esophagus length, and its formula is calculated as ultrasonic combination parameter = abdominal esophagus length + 0.360/2.791 His angle.