TABLE 1.

Test–retest repeatability of the main outcome measures

Variable	Time 1 (mean ± SD)	Time 2 (mean ± SD)	p‐value	ICC	SEM
Pain severity‐average	77.7 ± 16.5	78.8 ± 15.6	0.50	0.72	8.2
Pain severity‐highest	88.7 ± 14.0	89.2 ± 12.1	0.78	0.67	6.9
Pain severity‐lowest	48.7 ± 22.6	48.3 ± 21.3	0.86	0.66	12.9
Pain rating index	38.4 ± 18.1	39.1 ± 17.8	0.74	0.75	8.9
Number of painful regions	8.4 ± 6.3	8.3 ± 5.8	0.82	0.34	2.1
Self‐rated health	2.3 ± 1.0	2.4 ± 1.1	0.63	0.62	0.5
Quality of life	29.6 ± 19.4	28.1 ± 20.0	0.34	0.84	7.5
Pain interference	4.3 ± 0.9	4.3 ± 0.7	0.74	0.81	0.3

Note: p‐value in paired t‐test between test and retest.

Abbreviations: ICC, Intra class correlation coefficient; SD, Standard deviation; SEM, Standard error of measurement.