ID-5184 Wonca Abstracts supplement A-K 13-10-23 - Flipbook - Page 198
WONCA 2023 Supplement 1: WONCA 2023 abstracts (A–K)
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Selection among participating and non-participating
GPs and pregnant women in a general practice-based
pregnancy cohort
Dr Ruth Kirk Ertmann, DR Nicolaisdottir, J Kragstrup, G Overbeck, P Wilson, MC Lutteroed
University of Copenhagen
Objective
The aim of the present study was to examine selection in a general practice-based pregnancy cohort.
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Design
Survey linked to administrative register data.
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Setting and subjects
In spring 2015, GPs were recruited in two regions of Denmark and asked to invite all pregnant women
in their practice who had their first prenatal care visit before 15 August 2016 to participate in the survey.
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Outcome measures
Characteristics of GPs and the pregnant women were compared at each step in the recruitment
process – invitation of the GP, GP agreement to participate, actual GP participation, participation of
the woman – with an uncertainty coefficient to quantify the step where the largest selection occurs.
Results
Significant differences were found between participating and non-participating practices with regard
to practice characteristics such as number of patients registered with the practice, the age and sex
of doctors and type of practice. Despite these differences, the characteristics of the eligible patients
differed little between participating and non-participating practices. In participating practices,
significant differences were, however, observed between recruited and non-recruited patients.
Conclusion
The skewed selection of patients was mainly caused by a high number of non-participants within
practices that actively took part in the study. We recommend a focus on the sampling within
participating practices as the most important factor in representative sampling of patient populations
in general practice.
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