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. 2011 Dec;40(8):476–485. doi: 10.1259/dmfr/18407834

Table 3. The statistical difference between benign and malignant tumours concerning the quantitative variables.

Technique	Variable		Benign tumours	Malignant tumours	Mann–Whitney U	Z score	Wilcoxon W	P-value
SPD	PSV	Mean ± SD	28.23 ± 17.3	55.9 ± 15.01	9.000	−3.368	87.00	0.001*
	PSV	Range	9.2–59	20.5–70	9.000	−3.368	87.00	0.001*
	RI	Mean ± SD	0.66 ± 0.1	0.85 ± 0.06	0.00	−3.965	78.00	0.00*
	RI	Range	0.5–0.78	0.73–0.95	0.00	−3.965	78.00	0.00*
	PI	Mean ± SD	1.01 ± 0.217	1.5 ± 0.217	0.00	−3.963	78.0	0.00*
	PI	Range	0.67–1.27	1.23–1.83	0.00	−3.963	78.0	0.00*

P > 0.05 not significant

SPD, spectral Doppler; PSV peak systolic velocity; RI, resistive index; PI, pulsatility index

*P ≤ 0.05 significant