• 1
    Varga J, Abraham D. Systemic sclerosis: a prototypic multisystem fibrotic disorder. J Clin Invest 2007; 117: 55767.
  • 2
    Penta M, Thonnard JL, Tesio L. ABILHAND: a Rasch-built measure of manual ability. Arch Phys Med Rehabil 1998; 79: 103842.
  • 3
    Brower LM, Poole JL. Reliability and validity of the Duruöz Hand Index in persons with systemic sclerosis (scleroderma). Arthritis Rheum 2004; 51: 8059.
  • 4
    Silman A, Akesson A, Newman J, Henriksson H, Sandquist G, Nihill M, et al. Assessment of functional ability in patients with scleroderma: a proposed new disability assessment instrument. J Rheumatol 1998; 25: 7983.
  • 5
    Rannou F, Poiraudeau S, Berezne A, Baubet T, Le-Guern V, Cabane J, et al. Assessing disability and quality of life in systemic sclerosis: construct validities of the Cochin Hand Function Scale, Health Assessment Questionnaire (HAQ), Systemic Sclerosis HAQ, and Medical Outcomes Study 36-Item Short Form Health Survey. Arthritis Rheum 2007; 57: 94102.
  • 6
    Penta M, Tesio L, Arnould C, Zancan A, Thonnard JL. The ABILHAND questionnaire as a measure of manual ability in chronic stroke patients: Rasch-based validation and relationship to upper limb impairment. Stroke 2001; 32: 162734.
  • 7
    Durez P, Fraselle V, Houssiau F, Thonnard JL, Nielens H, Penta M. Validation of the ABILHAND questionnaire as a measure of manual ability in patients with rheumatoid arthritis. Ann Rheum Dis 2007; 66: 1098105.
  • 8
    Arnould C, Penta M, Renders A, Thonnard JL. ABILHAND-Kids: a measure of manual ability in children with cerebral palsy. Neurology 2004; 63: 104552.
  • 9
    LeRoy EC, Medsger TA Jr. Criteria for the classification of early systemic sclerosis. J Rheumatol 2001; 28: 15736.
  • 10
    Pincus T, Summey JA, Soraci SA Jr, Wallston KA, Hummon NP. Assessment of patient satisfaction in activities of daily living using a modified Stanford Health Assessment Questionnaire. Arthritis Rheum 1983; 26: 134653.
  • 11
    Clements PJ, Lachenbruch PA, Seibold JR, Zee B, Steen VD, Brennan P, et al. Skin thickness score in systemic sclerosis: an assessment of interobserver variability in 3 independent studies. J Rheumatol 1993; 20: 18926.
  • 12
    Valentini G, Della Rossa A, Bombardieri S, Bencivelli W, Silman AJ, D'Angelo S, et al. European multicentre study to define disease activity criteria for systemic sclerosis. II. Identification of disease activity variables and development of preliminary activity indexes. Ann Rheum Dis 2001; 60: 5928.
  • 13
    Medsger TA Jr. Natural history of systemic sclerosis and the assessment of disease activity, severity, functional status, and psychologic well-being. Rheum Dis Clin North Am 2003; 29: 25573, vi.
  • 14
    Rasch G. Probabilistic models for some intelligence and attainment tests. Chicago: MESA; 1980.
  • 15
    Tennant A, Conaghan PG. The Rasch measurement model in rheumatology: what is it and why use it? When should it be applied, and what should one look for in a Rasch paper? Arthritis Rheum 2007; 57: 135862.
  • 16
    Wright BD. Model selection: rating scale or partial credit? [letter]. Rasch Meas Trans 1999; 12: 6412.
  • 17
    Linacre JM. Comparing “partial credit” and “rating scale” models [letter]. Rasch Meas Trans 2000; 14: 768.
  • 18
    Bond TG, Fox CM. Applying the Rasch model: fundamental measurement in the human sciences. Mahwah (NJ): Lawrence Erlbaum; 2001.
  • 19
    Wright BD, Masters GN. Rating scale analysis. Chicago: Mesa Press; 1982.
  • 20
    Smith EV. Detecting and evaluating the impact of multidimensionality using item fit statistics and principal component analysis of residuals. J Appl Meas 2002; 3: 20531.
  • 21
    Andrich D, Sheridan BE. Interpreting RUMM2020: part II. Polytomous data. 3rd ed. Perth (WA): RUMM Laboratory; 2005.
  • 22
    Shrout P, Fleiss J. Intraclass correlations: uses in assessing rater reliability. Psychol Bull 1979; 86: 4208.
  • 23
    Fisher W. Reliability statistics [letter]. Rasch Meas Trans 1992; 6: 238.
  • 24
    Steen VD, Medsger TA Jr. Improvement in skin thickening in systemic sclerosis associated with improved survival. Arthritis Rheum 2001; 44: 282835.
  • 25
    Poole JL, Steen VD. The use of the Health Assessment Questionnaire (HAQ) to determine physical disability in systemic sclerosis. Arthritis Care Res 1991; 4: 2731.
  • 26
    Steen VD, Medsger TA Jr. The value of the Health Assessment Questionnaire and special patient-generated scales to demonstrate change in systemic sclerosis patients over time. Arthritis Rheum 1997; 40: 198491.
  • 27
    Smyth AE, MacGregor AJ, Mukerjee D, Brough GM, Black CM, Denton CP. A cross-sectional comparison of three self-reported functional indices in scleroderma. Rheumatology (Oxford) 2003; 42: 7328.
  • 28
    Duruoz MT, Poiraudeau S, Fermanian J, Menkes CJ, Amor B, Dougados M, et al. Development and validation of a rheumatoid hand functional disability scale that assesses functional handicap. J Rheumatol 1996; 23: 116772.
  • 29
    Poiraudeau S, Chevalier X, Conrozier T, Flippo RM, Liote F, Noel E, et al. Reliability, validity, and sensitivity to change of the Cochin hand functional disability scale in hand osteoarthritis. Osteoarthritis Cartilage 2001; 9: 5707.