Validation of French version of the Scleroderma Health Assessment Questionnaire (SSc HAQ).
The modified Scleroderma Health Assessment Questionnaire (SSc HAQ) is a functional score to assess systemic sclerosis (SSc) comprising the HAQ disease index (HAQ-DI) plus five specific visual analogue scales (VAS). Since it was validated in English-speaking patients only, its general use in any other language necessitates prior cross-cultural adaptation and validation. We designed this study to assess its value in French-speaking patients and to validate the French version according to international recommendations. We elaborated a French version using the "forward-backward" method. We then validated its psychometric properties with 100 consecutive SSc French-speaking patients who had undergone simultaneous clinical and paraclinical examination. In addition, we calculated the SSc HAQ score, a new outcome measure, which is obtained by pooling the eight domains from the HAQ-DI with the five organ VAS. Our study confirmed the psychometric properties of the SSc HAQ in non-English-speaking patients with (a) structural validity: the major component analysis, performed on the HAQ-DI and the five VAS, yielding a two-factor structure; (b) convergent validity: with high correlation coefficients between the SSc HAQ score and the physical component score of the SF-36 (r=-0.74, p<0.0001); (c) discriminant validity: the SSc HAQ score was better in patients with limited than with diffuse SSc (0.5+/-0.5 vs 1.1+/-0.7, respectively, p<0.0001) in relation to the number of clinical involvements; (d) reproducibility was high using the test-retest procedure (r=0.98). This study showed the value of the SSc HAQ, which is a simple, discriminant, reproducible self-administered questionnaire to evaluate French-speaking SSc patients. In addition, we suggest the use of a new outcome measure, the SSc HAQ score, to assess this systemic disease more accurately.
Georges
C
C
AP-HP, Internal Medicine, Saint-Louis Hospital, 1 avenue Claude Vellefaux, 75010 Paris, France. claire.georges@sls.ap-hop-paris.fr
Chassany
O
O
Mouthon
L
L
Tiev
K
K
Toledano
C
C
Meyer
O
O
Marjanovic
Z
Z
Heneggar
C
C
Papo
T
T
Crickx
B
B
Sereni
D
D
Cabane
J
J
Farge
D
D
D004185:Disability Evaluation; D005260:Female; D005602:France; D006305:Health Status Indicators; D006801:Humans; D008297:Male; D008875:Middle Aged; D010147:Pain Measurement; D011788:Quality of Life; D012189:Retrospective Studies; D012595:Scleroderma, Systemic / Q000175:diagnosis* / Q000453:epidemiology / Q000534:rehabilitation; D012720:Severity of Illness Index; D011795:Surveys and Questionnaires; D014177:Translations