Table 1 Characteristics of study population.

From: Habitual fish intake negatively correlates with prevalence of frailty among patients with rheumatoid arthritis

Characteristics

RA patients

(N = 306)

Age, years

63.5 (53–71)

Body composition and physical activity parameters

Body mass index, kg/m2

21.2 (19.3–23.7)

Skeletal mass index, kg/m2

5.7 (5.2–6.2)

Right hand grip, kg

15.5 (9.5–21.2)

Light hand grip, kg

15.0 (9.0–20.7)

Walking speed, m/s

1.0 (0.8–1.2)

Frailty score (SOF index)

0, n (%)

135 (44.1)

1, n (%)

100 (32.7)

2, n (%)

71 (23.2)

Any fall in previous year, n (%)

60 (19.6)

Any fracture in previous year, n (%)

18 (5.9)

RA disease characteristics

Duration, years

9.0 (3–21)

DAS28-ESR

2.8 (2.1–3.5)

HAQ score

0.5 (0–1)

Stage*

3 (2–4)

Class*

2 (1–2)

Current RA medications

Methotrexate use, n (%)

222 (72.5)

Prednisolone use, n (%)

88 (28.6)

Biological agent use, n (%)

134 (43.8)

Laboratory data

Hemoglobin, g/dL

12.6 (11.8–13.4)

Albumin, g/dL

3.9 (3.7–4.1)

CRP, mg/dL

0.1 (0–0.3)

Dietary habits**

Staple food for dinner

6 [1–8]

Fish dishes

4 [1–7]

Meat dishes

4 [1–8]

Egg dishes

4 [1–8]

Vegetable dishes

6 [1–8]

Fruits

6 [1–8]

Milk

6 [1–8]

  1. Data are expressed as median (interquartile) for continuous variables, median (range) for dietary habits scores, and numbers (%) for categorical variables.
  2. RA rheumatoid arthritis, SOF index Study of Osteoporotic Fractures index, DAS28-ESR 28-joint Disease Activity Score using erythrocyte sedimentation rate, HAQ health assessment questionnaire, TNF tumor necrosis factor, IL-6 interleukin-6, CTLA4 cytotoxic T-lymphocyte antigen 4, CRP C-reactive protein.
  3. *Steinbrocker's Stage and Class.
  4. **Dietary habit scores: 0 = seldom, 1 =  < 1 time/month, 2 = 1–3 times/month, 3 = 1–2 times/week, 4 = 3–4 times/week, 5 = 5–6 times/week, 6 = 1 time/day, 7 = 2 times/day, 8 = 3 times/day.
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