Background The Evaluation of Daily Activity Questionnaire (EDAQ) is a patient reported measure of activity limitations in Rheumatoid Arthritis (RA) (1,2) which we have revised and updated for use in the UK. This version includes 138 items in 14 “domains” (Eating/Drinking; Personal Care; Dressing; Bathing; Cooking; Moving Indoors; House Cleaning; Laundry; Moving and Transfers; Moving Outdoors; Gardening/Household Maintenance; Caring; and Leisure/Social Activities). Each domain is split into two sections: one (A) scores whether activities can be performed without aids, alternate methods or help; and another (B) which scores whether the activities can be performed with aids or alternate methods. All items are scored on a 0-3 scale (no difficulty to unable to do).
Objectives To test the validity, reliability and minimal detectable difference of the EDAQ in people with RA in the UK.
Methods Participants from 14 Rheumatology clinics completed postal questionnaires of demographic questions, the EDAQ (UK version), HAQ, SF36v2, RAQOL, pain, hand pain and fatigue numeric rating scales (NRS) and a current condition severity scale. Three weeks later, the EDAQ was mailed again to evaluate test-retest reliability: using kappa co-efficients for individual items; and non-parametric correlations for domain scores. Non-parametric correlations assessed the validity of the 14 domains of the EDAQ against the other measures. Cronbach’s alpha evaluated internal consistency.
Results 383 people participated: 286 women; age =60.38 (SD 11.18) years; RA duration =13.2 years (SD 10.72). 118 (31%) were employed; 65 had children <18y at home. Average pain score =4.99 (SD 2.59) and fatigue =5.61 (SD 2.53). All domains of the EDAQ correlated significantly (p<0.0005) with;
SF36 (Physical Function); rs= -0.57 to -0.86;
SF36 (Vitality): rs=-0.43 to-0.58;
HAQ: rs=0.72- 0.89;
Symptom severity: Pain: rs=0.48-0.65; hand pain: rs=0.55-0.74; fatigue: rs=0.42-0.58;
Condition severity: rs=0.53-0.68.
An exception was the “Caring” domain; most (59%) felt this domain inapplicable to them and validity was lower although still significant (rs=0.22 to 0.35).
Internal consistency was high in all domains (Cronbach’s alpha=0.89-0.97 for Section A and 0.88-0.98 for Section B). 309 (81%) completed Test 2 and test-retest reliability was moderate for most (n=108) items (0.41-0.60); substantial for 28 (0.61-0.80) and fair (0.21-0.40) for two. Reliability of total scores was excellent for 11 domains (rs=0.81 -0.88) and moderate-substantial for three (rs=0.54-0.73.
Minimal detectable differences was 1.60 to 4.61.
Conclusions The UK version of the EDAQ is a unidimensional, valid, reliable, sensitive measure of daily activity in people with RA. It can therefore be used in both clinical practice and research.
Nordenskiold et al (1996) Arthr Care Res 9(5):358-367
Nordenskiold et al (1998) Clin Rheumatol 17:6-16.
Disclosure of Interest None Declared
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