World Health Organization Disability Assessment Schedule 2.0

Rheumatoid Arthritis: (Meesters et al., 2009; n = 85; mean age = 61.0 years; mean duration of RA = 6.0 years; female = 77%; scores after inpatient and day-patient therapy by trained multidisciplinary team; Netherlands sample)

• Median score at baseline: 40.5

• Median score at 6 weeks after discharge: 4.6

Rheumatoid Arthritis: (Meesters et al., 2009)

• Excellent internal consistency (Cronbach’s alpha = 0.91)

Convergent validity:

Rheumatoid Arthritis: (Meesters et al., 2009)

• Adequate: HAQ, stair test, grip strength, D-AIMS2, DAS-28, VAS-Pain, and RAQoL (Pearson rank correlation coefficients = 0.50, 0.39, 0.29, 0.53, 0.28, 0.42, 0.52)

• Poor: 50-feet walk test, timed-stands test, and Escola Paulista de Medicina Range of Motion scale (Pearson rank correlation coefficients = 0.22, 0.20, 0.19)

Rheumatoid Arthritis: (Meesters et al., 2009)

• Adequate floor effect of 17% for subscale “understanding and communicating”

• Adequate floor effect of 18% for subscale “getting along with people”

• Adequate floor effect of 14% for subscale “self-care”

Rheumatoid Arthritis: (Meesters et al., 2009)

• High: “getting around” and “participation in society” (RR = 0.84, 0.80)

• Moderate: WHODAS 2.0 total score, “understanding and communicating”, “self-care”, “life activities” (RR = 0.58, 0.56, 0.58, 0.48)

• Low: “getting along with people” (RR = 0.04)

Schizophrenia: (Guilera et al., 2012; n = 352; mean age = 36.7; mean average duration of illness = 140.65 months; diagnoses include schizophrenia, schizoaffective disorder and schizophreniform disorder; Spanish sample)

• Excellent test-retest reliability: (ICC = 0.92). Subscale range = 0.63-0.88

Trauma: (Abedzadeh-kalahroudi, 2015; n = 220; mean age = 34.7; mean time post trauma = at least 24 hours; mean GCS score = 12.7; Persian)

• Excellent interrater reliability: (ICC = 0.99)

Trauma: (Abedzadeh-kalahroudi, 2015)

• Acceptable to Excellent: Cronbach’s alpha = 0.51-0.87 (only 3/12 items had an alpha value < 0.68)

Schizophrenia (Guilera et al., 2012)

• Excellent: Cronbach’s alpha = 0.94)

Normative Sample: (Haley et al., 1992; n = 412)

• Excellent: Cronbach's alpha range from 0.95-0.99

Schizophrenia (Guilera et al., 2012)

• Low/Moderate to High correlation with the Positive and Negative Syndrome Scale (PANSS-G) and the Hamilton Depression Rating Scale (HAM-D)

Trauma: (Abedzadeh-kalahroudi et al., 2015)

• Items representing the activity domain have a very strong mean Spearman’s rank coefficient (rho = .81). The range for these items is 0.67 - 0.93)

• Items representing the participation domain have a strong mean Spearman’s rank coefficient (rho = .76). The range for these items is 0.50 - 0.92)

Schizophrenia (Guilera et al., 2012)

• All indicators are relevant for defining the corresponding domains (cognition, mobility, self-care, getting along, life activities and participation).

Schizophrenia (Guilera et al., 2012).

• Strong floor effects

• Strong ceiling effects, with more than 60% of participants obtaining the best score on sub scales of “getting around” and “self-care”

Spinal Cord Injury: (De Wolf et al., 2012; n = 63; mean age = 34.7 years; studied at 2 years post discharge from inpatient unit; male = 81%; ASIA Impairment Scale: A = 59%, B = 6%, C = 6%, D = 29%; Australian sample)

• Excellent internal consistency for WHODAS 2.0 Total Score (Cronbach’s alpha = 0.95)

• Excellent internal consistency for following domains: “understanding and communicating”, “self-care”, “life activities”, and “participation” (Cronbach’s alpha = 0.93, 0.94, 0.96, 0.97)

• Adequate internal consistency for “getting along with others” domain (Cronbach’s alpha = 0.73)

• Poor internal consistency for “getting around” domain (Cronbach’s alpha = 0.61)

Discriminant validity:

Spinal Cord Injury: (De Wolf et al., 2012)

• Excellent discriminant validity for WHODAS 2.0 Total Score (Mann-Whitney U = 2.02)

• Excellent discriminant validity for following domains: “getting around”, “self-care”, and “life activities” (Mann-Whitney U = 2.79, 4.90, 1.89)

Spinal Cord Injury: (De Wolf et al., 2012)

• Adequate ceiling effect of following domains: “getting along with others” and “life activities” (Ceiling Effects % = 19, 16)

• Poor ceiling effect of following domains: “understanding and communicating” and “self-care” (Ceiling Effects % = 54, 29)

Stroke: (Schlote et al., 2008, n = 84; mean age = 56; diagnoses include: ischemic and hemorrhagic strokes)

• Satisfactory to Excellent Interrater Reliability (ICC= 0.64*-0.94)

*Understanding and Communication and Total Score

Stroke: (Küçükdeveci et al., 2013; n = 188; mean age = 61; time since stroke: min = 3 months, median = 27 months, and max = 240 months)

• Excellent: Cronbach's Alpha = 0.90- 0.93

Stroke: (Schlote et al., 2008)

• Good to Excellent: Cronbach's Αlpha = 0.81-0.99

Stroke: (Schlote et al., 2008)

• Items representing the different domains of the assessment have varying Spearman’s Rank coefficients ranging from low to strong: (0.31-0.83)

• Low to moderate correlation with ratings for understanding and communicating (rho = 0.44-0.56).

• Moderate to strong correlation with rating for getting around (rho = 0.60-0.75).

• Moderate to strong correlations with rating for self-care (rho = 0.62-0.83)

• Moderate correlation with ratings for getting along with people (rho = 0.43-0.58).

• Moderate to strong correlation with ratings for life activities (rho = 0.64-0.78).

• Low to moderate correlation with ratings for participation in society (rho = 0.31-0.59).

• Moderate correlation with ratings for single items (rho = 0.49-0.58)