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Table 1 Determination of HAQ-DI-dcrit in patients on stable therapy

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

Population

N

Standard deviation

Pearson correlation coefficient

Standard error measurement

One-sided HAQ-DI-dcrit

Total discovery cohort

1645

0.73

0.86

0.39

0.641

Men

453

0.66

0.85

0.37

0.604

Women

1186

0.75

0.86

0.40

0.655

Aged < 60 years at baseline

986

0.68

0.83

0.39

0.646

Aged ≥60 years at baseline

652

0.76

0.87

0.39

0.634

Baseline HAQ-DI < 1

684

0.44

0.66

0.36

0.597

Baseline HAQ-DI ≥1

914

0.70

0.83

0.41

0.673

  1. Abbreviations: 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)