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Table 1 Subject characteristics, disability, and force measurements in the rheumatoid arthritis (RA), hand osteoarthritis (HOA), and healthy groups

From: Differences in muscle activity during hand-dexterity tasks between women with arthritis and a healthy reference group

Sociodemographic RA(n= 20) HOA(n= 16) Healthy(n= 20)
Age (years) m1 (95% CI) 59.5 (54–64) 68.1 (62–72) 56.0 (51–60)
Disease duration (years) m (95% CI) 20.0 (15.1–28.2) 15.0 (11.5–20.3) Na
Medication* (%) 100 41.1 Na
Measurements of disability
Quick DASH2 m (95% CI) 40.9 (33.2–50.7) 31.8 (30.8–45.2) 2.3 (0.9–10.5)
VAS stiffness3 m (95% CI) 3.0 (2.0–4.1) 4.0 (2.5–5.1) Na
VAS pain3 m (95% CI) 2.0 (1.5–3.0) 3.9 (3.1–5.0) Na
Hand force ( N )    
Max extension (N)4 m (95% CI) 20.0 (17.8–26.1) 26.0 (21.4–31.5) 33.5 (30.6–39.3)
Max flexion (N)5 m (95% CI) 81.0 (67.4–137.4) 81.5 (70.8–125.8) 245.0 (195.3–275.6)
  1. 1Mean with 95% Confidence interval.
  2. 2QuickDASH: Disability in arm shoulder and hand, 0–100 best to worst.
  3. 3VAS stiffness and VAS pain, 0–10cm, best to worst.
  4. 4Measured with EX-it, value in Newtons (N).
  5. 5Measured with Grippit, value in Newtons (N).
  6. *Self-reported medication, painkillers or disease modifying drugs (RA only).