Cost effectiveness of a prize draw on response to a postal questionnaire: results of a randomised trial among orthopaedic outpatients in Edinburgh. | Zendy

Arik Brown | Zendy; Henrietta Lawrie | Zendy; A D Kennedy | Zendy; J.A.W. Webb | Zendy; David Torgerson | Zendy; A. Grant | Zendy

Open Access

Cost effectiveness of a prize draw on response to a postal questionnaire: results of a randomised trial among orthopaedic outpatients in Edinburgh.

Author(s) -

Arik Brown,

Henrietta Lawrie,

A D Kennedy,

J.A.W. Webb,

David Torgerson,

A. Grant

Publication year - 1997

Publication title -

journal of epidemiology and community health

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.692

H-Index - 170

eISSN - 1470-2738

pISSN - 0143-005X

DOI - 10.1136/jech.51.4.463

Subject(s) - medicine , statistical significance , sample size determination , significant difference , randomized controlled trial , physical therapy , mean difference , sample (material) , confidence interval , statistics , chemistry , mathematics , chromatography

Study sample Power calculations were used to determine the sample size. A 1300-patient sample would demonstrate a 10% absolute difference (0.01 significance, 90% power), and have an evens chance of identifying a 5% difference at the 0.05 significance level. A total of 1,307 patients were eligible for inclusion in the study. A total of 654 patients were randomly included in the intervention group, and 653 were randomly allocated to the control group.

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