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Are ‘healthy cohorts’ real-world relevant? Comparing the National Child Development Study (NCDS) with the ONS Longitudinal Study (LS)

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Key messages
  1. This study compared the NCDS with the ONS LS – a ‘gold-standard’ national reference population.

  2. Participants from the most recent NCDS 55-year survey were mostly unrepresentative of age-matched LS respondents.

  3. Despite differences in sample characteristics, longitudinal associations were similar in the NCDS and LS samples.
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Keywords: attrition; census; cohort study; loss to follow-up; representativeness

Affiliations: 1: Department of Epidemiology and Public Health UCL, London, UK 2: Department of Psychological Medicine, KCL, London, UK 3: Department of Epidemiology and Public Health, UCL, London, UK 4: Department of Statistical Science, UCL, London, UK

Appeared or available online: February 6, 2020

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