Table 3 Risk factors for HDF in foetuses with maternal alloimmunization

Previous affected pregnancies per woman^a

1(0–2)

0 (0–0)

<0.001

5.66(3.561–9.006)

<0.001

5.34(3.156–9.036)

Maternal transfusion history, n (%)

18(15.0)

21(14.5)

0.906

0.96(0.485–1.898)

0.021

3.74(1.219–11.464)

Maternal antibody titre^a

1:512(1:256-1:1792)

1:64(1:16 − 1:256)^c

<0.001

1.00(1.001–1.002)

<0.001

1.00(1.001–1.002)

Major ABO incompatibility, n (%)

9(7.7)^d

26(19.8)^e

0.319

0.72(0.376–1.375)

0.488

0.73(0.303–1.767)

Types of maternal antibody

 Anti-D, n (%)

82(68.3)

121(83.4)

-

-

-

-

 Anti-D combined with others, n (%)

23(19.1)

15(10.3)

0.024

2.26(1.114–4.594)

0.598

0.74(0.246–2.246)

 Other single-antibody, n (%)

15(12.5)

9(4.8)

0.043

2.46(1.028–5.886)

0.042

3.25(1.043–10.114)