Assessing research outcomes by postal questionnaire with telephone follow-up | Zendy

Chris Parker | Zendy; Michael Dewey | Zendy

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Assessing research outcomes by postal questionnaire with telephone follow-up

Author(s) -

Chris Parker,

Michael Dewey

Publication year - 2000

Publication title -

international journal of epidemiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.406

H-Index - 208

eISSN - 1464-3685

pISSN - 0300-5771

DOI - 10.1093/ije/29.6.1065

Subject(s) - medicine , missing data , telephone interview , data collection , imputation (statistics) , non response bias , telephone call , physical therapy , statistics , social science , sociology , mathematics , pathology , electrical engineering , engineering

Face-to-face assessment of research outcomes is expensive and may introduce bias. Postal questionnaires offer a cheaper alternative which avoids observer bias, but non-response and incomplete response reduce the effective sample size and may be equally serious sources of bias. This study examines the extent and potential effects of missing data in the postal collection of outcomes for a large rehabilitation trial.

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