Birth history
Birth and gestation data were available in 108 and 112 children respectively (Table 2). The median gestational age was 40 weeks (interquartile range (IQR)=38-40) and the mean birthweight was 3270g (standard deviation (SD)=570). Six children had low birthweight (less than 2500g), four of whom were premature, and the youngest born at 30 weeks’ gestation.