Variable

NEC (n = 13)

No NEC (n = 385)

P-value

Umbilical cord insertion

- Velamentous, n (%)

- Marginal, n (%)

- Paracentral, n (%)

- Central, n (%)

3 (25.0)

3 (25.0)

5 (41.7)

1 (8.3)

47 (12.4)

100 (26.5)

218 (57.7)

13 (3.4)

0.200

0.235

0.910

0.270

Placental weight, mean, grams (SD)

241.0 (64.5)

344.9 (135.6)

0.009

Unequal placental sharing, n (%)

10 (76.9)

243 (60.6)

0.235

VV anastomoses, n (%)

3 (23.1)

93 (24.2)

0.929

AV anastomoses, n (%)

13 (100)

346 (90.3)

0.239

VA anastomoses, n (%)

7 (53.8)

291(76.0)

0.069

Unbalanced interfetal transfusion through AV anastomoses, n (%)

10 (76.9)^†

126 (31.4)

0.001

AA anastomoses, n (%)

9 (69.2)

328 (85.2)

0.116