Egyptian Journal of Radiology and Nuclear Medicine

Table 2 Comparison of predictive number for detection of RDS using either PA-RI or Lung volume or by combining both measurements

From: Which is more accurate measuring pulmonary artery resistance index or 4D lung volume for prediction of neonatal respiratory distress in preterm pregnancies?

Items	RD						Chi-Square
	Developed RDS		Did not develop RDS		Total		Chi-Square
	N	%	N	%	N	%	X²	P value
PA-RI
Negative	14	23.73	73	82.95	87	59.18	51.286	< 0.001*
Positive	45	76.27	15	17.05	60	40.82	51.286	< 0.001*
Lung volume
Negative	16	27.12	58	65.91	74	50.34	21.259	< 0.001*
Positive	43	72.88	30	34.09	73	49.66	21.259	< 0.001*
Combining these parameters
Negative	0	0.00	58	65.91	58	39.46	64.228	< 0.001*
Positive	59	100.00	30	34.09	89	60.54	64.228	< 0.001*

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