Study population
BiB is a longitudinal multi-ethnic community birth cohort of 12453 women
(including 6900 South Asian, 50.1%) established in Bradford in 2007 to
understand the reasons behind poor health outcomes within the
city.12 The cohort aimed to examine how environmental,
genetic, behavioural and social factors impact on the health of the
mother and child, and development from childhood through to adult
life.12 Bradford is the sixth largest city in the UK
and is one of the most deprived areas in the UK.12