title: Representativeness of participants in a lifestyle intervention study in obese pregnant women - the difference between study participants and non-participants.
abstract: OBJECTIVE
  To examine the representativeness of participants attending a lifestyle intervention study addressing obese pregnant women.
  
  
  METHODS
  Retrospective comparison of baseline data, attendance to oral glucose tolerance test (OGTT) during pregnancy, and pregnancy outcome in eligible women stratified according to study participation. Of 750 eligible women with a self-reported BMI > 30 kg/m(2), and a live singleton pregnancy, 510 were eligible for inclusion and 425 were randomized to either active intervention (n= 284) or to standard obstetric care (n= 141) including two standard OGTT. The 85 women who declined participation or were excluded due to competing diseases and 240 women who did not respond to the initial invitation received the same standard care.
  
  
  RESULTS
  The randomized women had similar BMI but a lower parity and age, and were more frequently non-smokers, born in Denmark and married or cohabitating with their partner than the non-participants. Women participating in the trial had a higher compliance to the second OGTT compared to non-participants, also after correcting for age and nationality. There was no difference in pregnancy outcome, i.e., fetal weight and length, gestational age as well as mode of delivery.
  
  
  CONCLUSIONS
  Women declining participation in a randomized lifestyle intervention study in pregnancy have characteristics indicating they are those who might benefit the most from lifestyle intervention.
authors.affiliation: Department of Obstetrics and Gynecology, Hvidovre Hospital, Hvidovre, Denmark.
authors.forename: Joanna
authors.initials: J
authors.lastname: Gesche
authors.forename: Kristina
authors.initials: K
authors.lastname: Renault
authors.forename: Kirsten
authors.initials: K
authors.lastname: Nørgaard
authors.forename: Lisbeth
authors.initials: L
authors.lastname: Nilas
mesh_terms: D000328:Adult; D015992:Body Mass Index; D003718:Denmark; D015444:Exercise; D005260:Female; D005951:Glucose Tolerance Test; D006801:Humans; D008019:Life Style; D009765:Obesity / Q000150:complications*; D010342:Patient Acceptance of Health Care; D018579:Patient Selection; D011247:Pregnancy; D011248:Pregnancy Complications; D011256:Pregnancy Outcome; D011295:Prenatal Care; D012189:Retrospective Studies; D015430:Weight Gain