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Rheumatoid Arthritis: (Walker et al. 2005, n = 836; mean age 53.3 years ¡À 10.5 years; 77% of subjects female; 39.4% of subjects college graduates; mean and median hours worked were 36.9 (¡À 13.9) and 40.0 respectively; 6.0% of subjects worked 10 hours or less; reported health kept patients from performing their work 3.9 days ¡À 7.4 in the last 30 days; number of limited days in last six months 20.7 ¡À 40.7)

• 5.9 (SD 5.6)

Rheumatoid arthritis: (Lerner et al. 2001, n = 121; mean age 41.3 years ¡À 11.1; 27.3% male; 85.1% White; education mean: 15.1 (1.9))

Rheumatoid Arthritis: (Walker et al. 2005)

• High alpha reliability for WLQ components
  • Time Management Demands (TMS) (alpha = 0.87)
  • Physical Demands (PDS) (alpha = 0.83)
  • Mental Demands (MDS) (alpha = 0.83)
  • Output Demands (ODS) (alpha = 0.84)

Rheumatoid Arthritis: (Lerner et al. 2001)

Rheumatoid Arthritis: (Walker et al. 2005)

• Inversely associated with SF-36 Mental Component Score (r = - 0.60) and Physical Component Score (r=- 0.49)
  • Fatigue (r=0.50)
  • Pain (r=0.46)
  • Health Assessment Questionnaire (HAQ) (r=0.56)
  • HAQ-II (r=0.54)
• Weaker associations with WLQ and SF-36:
  • Days unable to perform (r=0.29)
  • Days activities cut down (r=0.38)
  • Education level (r=- 0.13)
  • Annual earnings (r= - 0.10)

• Correlations of these variables with HAQ
  • Days unable to perform (r=0.30)
  • Days activities cut down (r=0.37)
  • Education level (r=- 0.15)
  • Annual earnings (r=- 0.20)

• No association found between the WLQ index and Rheumatoid Arthritis duration (coefficient = 0.02)

Rheumatoid Arthritis: (Lerner et al. 2001)

Osteoarthritis: (Lerner et al. 2002, n = 230; mean age 53.7 years ¡À 7.1; 65.4% female; 94.7% Caucasian; highest-level education: 34.8% high school, 37.9% college, 27.3% post graduate; occupation: 56.1% non-manual, 25.2% sales and service, 17.0% manual, 1.7% missing; 10.5% self-employed)

Healthy controls: (Lerner et al. 2002, n = 37; mean age 45.0 years ¡À 6.91; 54.1% female; 94.6% Caucasian; highest-level education: 27.8% high school, 55.5% college, 16.7% post graduate; occupation: 37.8% non-manual, 46.0% sales and service, 16.2% manual, 0% missing; 11.1% self-employed)

Osteoarthritis: (Lerner et al. 2002)

• Cronbach¡¯s alpha values
  • Physical demands (¦Á=0.93)
  • Time management (¦Á=0.95)
  • Mental-interpersonal demands (¦Á=0.97)
• Output demands (¦Á=0.96)

Osteoarthritis: (Lerner et al. 2002)

• High item-to-scale correlation coefficients: Mental-Interpersonal, Time Management, and Output Demands scales (0.79-0.92)
• Comparatively lower item-to-scale correlation in Physical Demands scale (0.72-0.82)

Osteoarthritis: (Lerner et al. 2002

• Percent Highest limitations for OA patients
  • Physical demands (0.9)
  • Time management (2.2)
  • Mental-interpersonal demands (1.3)
  • Output demands (1.8)

• Percent Lowest limitations for OA patients
  • Physical demands (20.4)
  • Time management (24.9)
  • Mental-interpersonal demands (25.8)
  • Output demands (27.7)

Upper extremity Deficits: (Roy 2011, n=509, mean age: 45.3 (9.2), 57% female, outpatient clinic)

• WLQ-25 index score: 10.6 (5.9)
• WLQ-25 Summed score: 37.5 (18.1)

Upper extremity Deficits: (Roy 2011)

a WLQ-25:Work Limitations Questionnaire-25, RA-WIS:Work Instability Scale for Rheumatoid Arthritis, CPG:Chronic Pain Grade Questionnaire, SPADIP:pain subscale of the Shoulder Pain and Disability Questionnaire. Correlations above .50 (moderate [.70r.50] to high [r.70] correlations) are shown in boldface type. * Significant at P.05, ** significant at P.01.

Upper extremity Deficits: (Roy 2011)

• 16% Ceiling effect at baseline
• 29-23% ceiling effect at 6 month follow up