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Figure 1 | BMC Public Health

Figure 1

From: Response rates and selection problems, with emphasis on mental health variables and DNA sampling, in large population-based, cross-sectional and longitudinal studies of adolescents in Norway

Figure 1

Flow chart of the study populations. a27 individuals had an unknown address for the postal-based reminder; b61 individuals had an unknown address and 173 did not consent to be invited to a follow-up; c27 had an unknown address and 229 did not consent to be invited to a follow-up. An additional 55 who gave their consent, but did not fill out the questionnaire at baseline, were invited, of whom 18 participated. They are defined as non-responders at baseline, and are not included in the present analyses.

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