Sampling procedure, participation rates and representativeness in the Swedish part of the European Youth Heart Study (EYHS)
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Key result
Participants in the Swedish European Youth Heart Study were generally representative of the source population, though they had slightly higher socio-economic backgrounds and significantly higher marks in physical education compared to non-participants.
Population
2,313 sampled boys and girls aged 9 and 15 years from 37 state schools in two regions of Central Sweden.
Design
Cross-sectional
Authors
Discussion
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Member takes
Implication
Minor selection biases warrant cautious interpretation of EYHS cardiovascular findings; leaves open generalizability to lower-SES populations.
Study Design
Type
Cross-Sectional (n=2,313)
Multicenter
Yes
Structured PICO
P
Population
2,313 sampled boys and girls aged 9 and 15 years from 37 state schools in two regions of Central Sweden (Örebro and southern Stockholm).
C
Comparator
Non-participants and official regional/national demographic data
O
Outcome
Representativeness of participants regarding socio-economic status, school marks, and health attitudes/behaviors
Despite a 50% participation rate, participants in the Swedish EYHS were broadly representative of the target population, though they exhibited slightly higher socio-economic status and greater interest in physical exercise.
Limitations
- Low overall participation rate of about 50%
- Self-selection bias regarding interest in physical exercise
- Slight over-representation of non-manual working parents
- Inability to use personal identification codes for non-participants
- Under-representation of lower SES families
- Self-reported questionnaire data
Cite This Study
Wennlöf et al. (2003) conducted a cross-sectional in Cardiovascular disease risk factors (n=2,313). Study participation vs. Non-participation was evaluated on Representativeness (socio-economic status, school marks, and questionnaire responses). Participants in the Swedish European Youth Heart Study were generally representative of the source population, though they had slightly higher socio-economic backgrounds and significantly higher marks in physical education compared to non-participants.
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