Types of participants
Pregnant women of any BMI. We considered studies recruiting
women with normal BMIs to have a ’low risk’ of weight-related
complications at baseline, those recruiting women from the general
population including women of any BMI to have a ’mixedrisk’
status, and studies of overweight and/or obese women, or
high-risk women, as defined by the investigators, to have a ’highrisk’
status.