Seemingly minor changes to a questionnaire can make a big difference to mean scores: a cautionary tale

Author: Goodman Robert   Iervolino Alessandra   Collishaw Stephan   Pickles Andrew   Maughan Barbara  

Publisher: Springer Publishing Company

ISSN: 0933-7954

Source: Social Psychiatry and Psychiatric Epidemiology, Vol.42, Iss.4, 2007-04, pp. : 322-327

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