Methodology of an International Study of People with Multiple Sclerosis Recruited through Web 2.0 Platforms: Demographics, Lifestyle, and Disease Characteristics

Table 1

Summary of validated tools used.

Outcome variable	Instrument (reference)	Number of items	Authors (reference)
Disability	Patient determined disease steps (PDDS)	1	Hohol et al., 1995 [12]
Comorbidities	Self-administered comorbidity questionnaire (SCQ)	13	Sangha et al., 2003 [13]
Health-related quality of life	Multiple sclerosis quality of life-54 (MSQOL-54)	54	Vickrey et al., 1995 [14]
Dietary habits	Diet habits questionnaire (DHQ), modified	20	McKellar et al., 2008 [15]
Physical activity	International physical activity questionnaire (IPAQ)	7	Craig et al., 2003 [16]
Social support	Single item measure of social support (SIMSS)	1	Blake and McKay, 1986 [17]
Fatigue	Fatigue severity scale (FSS)	9	Krupp et al., 1989 [18]
Depression	Patient health questionnaire short version (PHQ-2)	2	Kroenke et al., 2003 [19]