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Nurs Res. 2002 Jan-Feb;51(1):59-62.

Examining test-retest reliability: an intra-class correlation approach.

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1
National Cheng Kung University, Tainan, Taiwan, ROC.

Abstract

BACKGROUND:

There are limitations of inter-class correlation (usually, the Pearson's product-moment correlation) in evaluating reliability of an instrument. An intra-class correlation approach would be appropriate to examine the test-retest reliability of an instrument.

OBJECTIVES:

To introduce an intra-class correlation approach to examine the test-retest reliability of an instrument.

METHOD:

The method of constructing an intra-class correlation coefficient was presented.

RESULTS:

The instrument with visual analog scales to measure the perceived competence to practice breast self-examination and perceived barriers to breast self-examination was tested. The intra-class correlation coefficient was 0.640.

CONCLUSION:

The intra-class correlation is an alternative to test the reliability of an instrument and it is more sensitive to the detection of systematic error.

PMID:
11822570
[Indexed for MEDLINE]
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