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Table 2 Patient baseline characteristics by change in HAQ-DI between month 0 and month 6

From: Use of a “critical difference” statistical criterion improves the predictive utility of the Health Assessment Questionnaire-Disability Index score in patients with rheumatoid arthritis

Baseline characteristicHAQ-DI-dcrit improvement (≥0.68)Small improvement (≥0.22 to < 0.68)No improvement
(< 0.22)
n6399611295
Age, years53.2 (13.4)56.2 (12.4)57.7 (11.7)
Women, %72.173.578.6
BMI, kg/m226.3 (4.9)27.1 (5.6)27.8 (6.1)
Disease duration, years7.5 (7.2)9.7 (8.6)10.4 (9.7)
DAS285.4 (1.2)5.3 (1.2)5.1 (1.1)
HAQ-DI1.60 (0.51)1.48 (0.56)1.44 (0.55)
Paina6.9 (1.9)6.4 (2.0)6.2 (2.1)
Fatiguea6.5 (2.4)6.0 (2.5)5.9 (2.5)
Patient global assessmenta6.8 (2.1)6.3 (2.0)6.1 (2.1)
Tender joint count9.2 (6.8)9.7 (7.0)8.9 (6.8)
Swollen joint count6.8 (5.8)6.7 (5.8)5.7 (5.2)
  1. Abbreviations: BMI body mass index, DAS28 Disease Activity Score-28 joints, HAQ-DI Health Assessment Questionnaire-Disability Index, HAQ-DI-dcrit critical difference for change beyond random variation in the HAQ-DI (decrease ≥0.68 from baseline)
  2. Data are presented as mean (standard deviation) unless otherwise indicated; complete data were not available for all patients
  3. aMeasured on a categorical scale ranging from 0 (best) to 10 (worst)