Selfselection in epidemiological studies may introduce selection bias and influence the
validity of study results. To evaluate potential bias due to selfselection in a large …

Background: This paper describes the background, aim and study design for the Swedish
SELMA study that aimed to investigate the importance of early life exposure during …

Background: Participation rates in large cohort studies have decreased during the last 2
decades. The consequences of this trend for relative risk estimation are unknown. Methods …

Background: It is well known that the time from conception to early childhood has importance
for health conditions that reach into later stages of life. Recent research supports this view …

Loss to follow-up in cohort studies may result in biased association estimates. Of 61,895
women entering the Danish National Birth Cohort and completing the first data-collection …

Self-selection into prospective cohort studies and loss to follow-up can cause biased
exposure-outcome association estimates. Previous investigations illustrated that such …

Background The aim of pregnancy cohorts was to understand causes and development of
health and disease throughout the life course. A major challenge in cohort studies is to avoid …

Background During the past 25 years, many pregnancy and birth cohorts have been
established. Each cohort provides unique opportunities for examining associations of early …

This is an update of the Norwegian Mother and Child Cohort Study (MoBa) cohort profile
which was published in 2006. Pregnant women attending a routine ultrasound examination …

Background: Many pregnancy and birth cohort studies investigate the health effects of early-
life environmental contaminant exposure. An overview of existing studies and their data is …