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Table 4 Known-Groups Validity of Duration of MJS and Severity of MJS Using DAS28-ESR Subgroups at Day 1 and Week 4, and CDAI Subgroups at Day 1

From: Psychometric properties of morning joint stiffness duration and severity measures in patients with moderately to severely active rheumatoid arthritis

PRO/Study

DAS28-ESR Category

p-value, ES

≤5.1

N, Mean (SD), Median

>5.1

N, Mean (SD), Median

Duration of MJS Day 1

 RA-BEAM

39, 120.5 (190.8), 60.0

496, 155.3 (180.1), 90.0

0.028a, 0.19

 RA-BUILD

36, 132.8 (191.5), 60.0

273, 164.9 (173.1), 120

0.033a, 0.18

Duration of MJS Week 4

 RA-BEAM

619, 76.1 (108.6), 37.3

587, 133.6 (153.5), 73.6

0.001a, 0.43

 RA-BUILD

327, 77.6 (112.0), 40.0

286, 151.1 (158.3), 94.6

0.001a, 0.54

Severity of MJS at Day 1

 RA-BEAM

39, 4.4 (2.7)

496, 5.9 (2.1)

0.001b, 0.70

 RA-BUILD

36, 4.0, (1.7)

274, 5.9 (2.0)

0.001b, 0.97

Severity of MJS at Week 4

 RA-BEAM

619, 3.0 (1.9)

587, 5.1 (2.1)

0.001b, 1.05

 RA-BUILD

327, 3.1 (1.9)

286, 5.3 (2.0)

0.001b, 1.13

 

CDAI Category

p-value, ES

0.0 to ≤22.0

N, Mean (SD), Median

>22.0 to ≤76.0

N, Mean (SD), Median

Duration of MJS Day 1

 RA-BEAM

36, 144.1 (198.3), 90.0

497, 153.9 (180.0), 90.0

0.305a, 0.05

 RA-BUILD

26, 111.9 (162.7), 60.0

278, 162.3 (170.6), 120

0.016a, 0.30

Severity of MJS at Day 1

 RA-BEAM

36, 4.7 (2.4)

497, 5.9 (2.1)

0.001b, 0.57

 RA-BUILD

26, 3.7 (1.6)

278, 5.9 (2.1)

0.001b, 1.07

  1. Abbreviations: CDAI Clinical Disease Activity Index, DAS28 Disease Activity Score modified to include the 28 diarthrodial joint count, ESR erythrocyte sedimentation rate, MJS morning joint stiffness, SD standard deviation, ES effect size
  2. a p-value based on a comparison of median values using the Kruskal-Wallis test
  3. b p-value based on a comparison of mean values using ANOVA