Open AccessImpact of Length or Relevance of Questionnaires on Attrition in Online Trials: Randomized Controlled Trial
Author(s) -
Jim McCambridge,
Eleftheria Kalaitzaki,
Ian R. White,
Zarnie Khadjesari,
Elizabeth Murray,
Stuart Linke,
Simon G. Thompson,
Christine Godfrey,
Paul Wallace
Publication year - 2011
Publication title -
journal of medical internet research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.446
H-Index - 142
eISSN - 1439-4456
pISSN - 1438-8871
DOI - 10.2196/jmir.1733
Subject(s) - randomized controlled trial , medicine , confidence interval , attrition , randomization , statistical significance , sample size determination , clinical trial , physical therapy , surgery , statistics , dentistry , mathematics
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