Predicting participation in the population-based Swedish cardiopulmonary bio-image study (SCAPIS) using register data

Research output: Contribution to journalArticle


Aims: To illustrate the importance of access to register data on determinants and predictors of study participation to assess validity of population-based studies. In the present investigation, we use data on sociodemographic conditions and disease history among individuals invited to the Swedish cardiopulmonary bio-image study (SCAPIS) in order to establish a model that predicts study participation. Methods: The pilot study of SCAPIS was conducted within the city of Gothenburg, Sweden, in 2012, with 2243 invited individuals (50% participation rate). An anonymous data set for the total target population (n = 24,502) was made available by register authorities (Statistics Sweden and the National Board of Health and Welfare) and included indicators of invitation to and participation in SCAPIS along with register data on residential area, sociodemographic variables, and disease history. Propensity scores for participation were estimated using logistic regression. Results: Residential area, country of birth, civil status, education, occupational status, and disposable income were all associated with participation in multivariable models. Adding data on disease history only increased overall classification ability marginally. The associations with disease history were diverse with some disease groups negatively associated with participation whereas some others tended to increase participation. Conclusions: The present investigation stresses the importance of a careful consideration of selection effects in population-based studies. Access to detailed register data also for non-participants can in the statistical analysis be used to control for selection bias and enhance generalizability, thereby making the results more relevant for policy decisions.


  • Jonas Björk
  • Ulf Strömberg
  • Annika Rosengren
  • Kjell Toren
  • Björn Fagerberg
  • Anna Grimby-Ekman
  • Göran M.L. Bergström
External organisations
  • Skåne University Hospital
  • University of Gothenburg
  • Sahlgrenska University Hospital
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Public Health, Global Health, Social Medicine and Epidemiology


  • Bias correction, inverse probability weighting, population-based study, propensity score, register data, residential area, validity
Original languageEnglish
Pages (from-to)45-49
Number of pages5
JournalScandinavian Journal of Public Health
Issue number17_suppl
Publication statusPublished - 2017 Jul 1
Publication categoryResearch

Related projects

Jonas Björk, Anton Nilsson, Ulf Strömberg & Carl Bonander

Swedish Council for Working Life and Social Research (Forte)


Project: Other

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Related activities

Björk, J. (Member of programme committee)
2017 Sep 132017 Sep 15

Activity: Participating in or organising an eventOrganisation of conference

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