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Table 5 Kruskal-Wallis test based on prognosis of distance grading :

From: Vascular ring: prenatal diagnosis and prognostic management based on sequential cross-sectional scanning by ultrasound

Distance grading

Number of Samples

Rank mean

Kruskal-Wallis

Grade I

7

4.00

X2 = 260.006

P = 0.000(df = 2)

Grade II

25

94.80

Grade III

340

197.00

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BMC Pregnancy and Childbirth

ISSN: 1471-2393

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