Low birth weight infants are at significant risk for death and disability. Improving outcomes for low birth weight infants requires access to advanced neonatal care, which is a limited resource in low- and middle-income countries. Identifying factors associated with infant birth weight may be useful in informing prevention strategies. In a cohort study, researchers obtained data from a random sample of pregnant women (all observations were independent) to investigate their primary research question of whether smoking in pregnancy is associated with infant birth weight. They also wanted to understand whether the relationship between smoking and birth weight remains the same after accounting for gestation, maternal BMI and alcohol consumption during pregnancy.cohort study. based on this continuous variables such as babies weight should be reported the most apporpriate measure of centrality how would u choose one weight