The proportion of twin pregnancies increased from 2.6% in 1998 to 2.9% in 2010, although this did not reach statistical significance (test for trend: p=0.07).
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Increased risk of congenital heart disease in twins in the North of England between 1998 and 2010.
2
0.0700
0.0700
The sentences
Among twins, the association between CHD and maternal age was of borderline significance (p=0.07), with mothers aged <20 years having an increased risk of a pregnancy associated with CHD than mothers aged 20–29 years ( table 3 ).