Table 4

Reliability of PRUNE subscales and total scores
Subscale Mean score test Test SD Mean score retest Re-test SD ICC 95% CI Standard error of measurement (SEM) SEM% Minimum detectable change (MDC) MDC%
Pain/60 25.1 17.3 25.0 18.0 0.98 0.91-0.99 2.5 4 5.8 10
Sensori-motor symptoms/40 12.6 7.9 14.0 9.8 0.91 0.70-0.98 2.7 7 6.2 15
Specific activities/40 35.7 31.9 36.0 30.5 0.99 0.97- 0.999 3.1 8 7.3 18
Usual activities/40 10.8 13.2 13.4 13.0 0.87 0.57-96 4.7 11 11.0 27
Total Score/100 34.4 21.5 36.0 23.1 0.98 0.95-0.997 3.1 3 7.2 7

SD, Standard deviation; ICC, Intraclass correlation coefficient; CI, Confidence interval. A random sample of patients and visits were selected to do a retest questionnaire in 2–7 days. The % of SEM and MDC as a proportion of scale allows for comparability of these across different sized subscales.

MacDermid and Grewal

MacDermid and Grewal BMC Musculoskeletal Disorders 2013 14:146   doi:10.1186/1471-2474-14-146

Open Data