Which statement defines intra-rater reliability?

Which statement defines intra-rater reliability?

• A. Two raters independently assess the same patient
• B. The same rater tests the same patient on different occasions
• C. Different tests are used to measure the same construct
• D. The same rater tests the same patient on different conditions

Answer: (D)

Intra-rater reliability is about the repeatability of a measurement by the same examiner. It asks whether a single rater would obtain the same score when assessing the same patient on different occasions. This is typically evaluated with a test-retest approach: the same rater uses the same instrument on the same patient on separate occasions, and the results are compared (often using statistics like the intraclass correlation coefficient or Cohen’s kappa for categorical data). The other ideas describe different concepts: two raters (inter-rater reliability), using different tests for the same construct (validity or measurement equivalence), or a single rater across different conditions (a different form of variability).

Intra-rater reliability is about the repeatability of a measurement by the same examiner. It asks whether a single rater would obtain the same score when assessing the same patient on different occasions. This is typically evaluated with a test-retest approach: the same rater uses the same instrument on the same patient on separate occasions, and the results are compared (often using statistics like the intraclass correlation coefficient or Cohen’s kappa for categorical data). The other ideas describe different concepts: two raters (inter-rater reliability), using different tests for the same construct (validity or measurement equivalence), or a single rater across different conditions (a different form of variability).