American Journal of Epidemiology, Vol 152, Issue 8 788-792, Copyright © 2000 by Oxford University Press
J Merlo, G Berglund, E Wirfalt, B Gullberg, B Hedblad, J Manjer, B Hovelius, L Janzon, BS Hanson and PO Ostergren
A personal diary may be more appropriate than a questionnaire for assessing
self-reported current use of hormone therapy (estrogens, progestagens, or
their combination); however, use of a questionnaire is more feasible and
less expensive. The authors compared both methods for 16,060 Swedish women
aged 45-73 years from the Malmo Diet and Cancer Study (baseline,
1991-1996). In a reliability analysis, the authors investigated the
agreement (kappa value) between the questionnaire and the diary regarding
current hormone therapy use (yes vs. no), studying the ability to replicate
results whether or not they were correct. They also explored associations
between discrepancy and individual characteristics. A validity analysis was
conducted to determine whether use of the questionnaire achieved an outcome
without systematic error (i.e., high specificity and sensitivity); the
personal diary was considered the "gold standard." Agreement between both
methods was high: 95.5% (kappa = 0.840). The sensitivity was 84.9% and the
specificity 97.7%. Higher body mass index and being a widow were associated
with agreement, whereas age (50-59 years), use of anxiolytics/hypnotics or
opiates, high alcohol consumption, past smoking, and higher educational
level were associated with discrepancy. Compared with a personal diary, a
simple self-administered questionnaire is a valid method for assessing
current use of hormone therapy.
Self-administered questionnaire compared with a personal diary for assessment of current use of hormone therapy: an analysis of 16,060 women [In Process Citation]
Department of Community Medicine, Malmo University Hospital, Sweden. Juan.Merlo@smi.mas.lu.se
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