Linguistic and psychometric validation of the MSSS-88 questionnaire for patients with multiple sclerosis and spasticity in Germany

Table 2 MSSS-88 score distributions and reliability [at inclusion (n = 87), and FU1 for test-retest (n = 66)]

MSSS-88 subscale	No of items	Items mean (range)	Items SD (range)	Item total correlation	Scale Mean ± SD (range)	Floor effect* %	Ceiling effect* %	Cronbach’s alpha	Cronbach’s alpha original MSSS-88**	Test-retest ICC*** (n = 66)
Muscle Stiffness	12	2.09 - 3.07	0.82 - 1.04	0.67 - 0.83	59.3 ± 25.6 (5.6 – 100.0)	2.3	0.0	0.95	0.95	0.74
Pain and Discomfort	9	1.90 - 2.66	0.91 - 1.10	0.55 - 0.81	43.3 ± 26.7 (0.0 – 100.0)	1.2	2.4	0.92	0.95	0.67
Muscle Spasms	14	1.43 - 2.61	0.68 - 1.15	0.42 - 0.75	39.6 ± 23.9 (0.0 – 92.3)	0.0	2.3	0.92	0.93	0.47
Activities of Daily Living	11	2.16 - 2.74	1.03 - 1.17	0.81 – 0.90	47.1 ± 31.8 (0.0 – 100.0)	6.0	7.1	0.97	0.95	0.87
Walking	10	2.82 - 3.21	0.83 - 1.02	0.63 - 0.87	65.7 ± 25.6 (13.3 – 100.0)	8.6	0.0	0.95	0.96	0.67
Body Movements	11	2.46 - 3.28	0.83 - 1.11	0.78 - 0.87	58.8 ± 28.2 (6.1 – 100.0)	7.1	0.0	0.96	0.96	0.72
Emotional Health	13	1.54 - 2.36	0.77 - 1.04	0.69 - 0.84	34.1 ± 25.6 (0.0 – 94.9)	0.0	1.2	0.95	0.96	0.61
Social Functioning	8	1.74 - 2.63	0.87 - 1.09	0.66 - 0.84	36.6 ± 28.1 (0.0 – 100.0)	1.2	7.1	0.94	0.95	0.62

* Ceiling and floor effects are the percent of people scoring the best (ceiling, score = 0) or worst (floor, score = 100) possible.
**Hobart et al. [26].
*** Intra-Class Correlation Coefficient (ICC).

ISSN: 1477-7525