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Non-response and attrition in longitudinal studies
  1. Feifei Bu
  1. Behavioural Science and Health, University College London, London, UK
  1. Correspondence to Dr Feifei Bu, University College London, London, UK; f.bu{at}

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The paper from Taanila and colleagues1 examined the association of cohort study participation with self-reported health and well-being. It hypothesised that participation in cohort studies had a positive impact on self-reported health and well-being. The authors indeed found that those who participated more actively, especially among women, tended to have better self-reported health and well-being. However, as an analysis of association, the causal directionality cannot be established. We could also interpret the observed associations from an opposite perspective, asking the question if health and well-being have any impact on cohort study participation. This would touch on the topic of …

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  • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

  • Competing interests None declared.

  • Provenance and peer review Commissioned; internally peer reviewed.

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