Family history

Anti-IgG (%)

Odd ratio

95% CI

P value

EF

Negative

39/109 (35.8)

Ref

Positive past history

17/34 (50.0)

1.79

(0.82 - 3.91)

0.141[NS]

0.221

Positive current history

23/37 (62.2)

2.95

(1.37 - 6.37)

0.006

0.411