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Who does not participate in a follow-up postal study? a survey of infertile couples treated by in vitro fertilization.
Troude P., Bailly E., Guibert J., Bouyer J., de La Rochebrochard E.
BMC Medical Research Methodology 12, 1 (2012) 104 - http://www.hal.inserm.fr/inserm-00748705
Who does not participate in a follow-up postal study? a survey of infertile couples treated by in vitro fertilization.
Penelope Troude () 1, 2, 3, Estelle Bailly1, Juliette Guibert4, Jean Bouyer1, 2, Elise de La Rochebrochard1, 2
1 :  INED - Institut National d'Etudes Démographiques Paris
2 :  CESP - Centre de recherche en épidémiologie et santé des populations
INSERM : U1018 – Hôpital Paul Brousse – Assistance publique - Hôpitaux de Paris (AP-HP) – Université Paris XI - Paris Sud – Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)
16 avenue Paul Vaillant Couturier 94807 Villejuif Cedex, France
3 :  Service de Santé Publique et Economie de la Santé
Université Paris VII - Paris Diderot – PRES Sorbonne Paris Cité
5 Rue Thomas Mann 75013 Paris
4 :  Laboratoire de Procréation Médicalement Assistée
Institut Mutualiste de Montsouris
42 Boulevard Jourdan 75014 Paris
ABSTRACT: BACKGROUND: A good response rate has been considered as a proof of a study's quality. Decreasing participation and its potential impact on the internal validity of the study are of growing interest. Our objective was to assess factors associated with contact and response to a postal survey in a epidemiological study of the long-term outcome of IVF couples. METHODS: The DAIFI study is a retrospective cohort including 6,507 couples who began an IVF program in 2000-2002 in one of the eight participating French IVF centers. Medical data on all 6,507 couples were obtained from IVF center databases, and information on long-term outcome was available only for participants in the postal survey (n = 2,321). Logistic regressions were used to assess firstly factors associated with contact and secondly factors associated with response to the postal questionnaire among contacted couples. RESULTS: Sixty-two percent of the 6,507 couples were contacted and 58% of these responded to the postal questionnaire. Contacted couples were more likely to have had a child during IVF treatment than non-contactable couples, and the same was true of respondents compared with non-respondents. Demographic and medical characteristics were both associated with probability of contact and probability of response. After adjustment, having a live birth during IVF treatment remained associated with both probabilities, and more strongly with probability of response. Having a child during IVF treatment was a major factor impacting on participation rate. CONCLUSIONS: Non-response as well as non-contact were linked to the outcome of interest, i.e. long-term parenthood success of infertile couples. Our study illustrates that an a priori hypothesis may be too simplistic and may underestimate potential bias. In the context of growing use of analytical methods that take attrition into account (such as multiple imputation), we need to better understand the mechanisms that underlie attrition in order to choose the most appropriate method.
Sciences du Vivant/Médecine humaine et pathologie
Sciences du Vivant/Santé publique et épidémiologie

Articles dans des revues avec comité de lecture
BMC Medical Research Methodology (BMC Med Res Methodol)
Publisher BioMed Central
ISSN 1471-2288 

Infertility – IVF – Postal survey – Response rate
This study was not sponsored or funded by industry. It received funding only from French government agencies
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