Mental disorders, attrition at follow-up, and questionnaire non-completion in epidemiologic research. Illustrations from the CoLaus|PsyCoLaus study.

Finally, drug use disorders revealed potential associations with non‐response to the questionnaires, which has previously been published (Dupuis et al., 2014 ; Vega et al., 2010 ; Zhao et al., 2009 ), but in our study this association did not reach statistical significance after controlling for sociodemographic confounding variables.

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