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Table 1 Clinical characteristics of study population (n = 336)

From: Urinary sodium-to-potassium ratio associates with hypertension and current disease activity in patients with rheumatoid arthritis: a cross-sectional study

Age, years 61.8 ± 12.0
Male, n (%) 57 (17.0)
BMI, kg/m2 22.7 ± 3.7
Smoking status, n (%) 28 (8.3)
Diabetes mellitus, n (%) 29 (8.6)
Cerebral or cardiovascular disease, n (%) 6 (1.8)
RA-related parameters
 Duration, years 10.6 ± 9.6
 RF, IU/mL 38.5 (0–2833.6)
 Anti-CCP antibody, U/mL 50.45 (0.6–3260)
 CRP, mg/dL 0.1 (0.1–9.6)
 DAS28-ESR 2.4 (0.78–7.20)
 HAQ score 0.25 (0–2.50)
Laboratory data
 Serum Cre, mg/dL 0.69 ± 0.20
 eGFR, ml/min/1.73m2 74.6 ± 18.0
Blood pressure
 SBP (Branchial), mmHg 122.9 ± 17.4
 DBP (Branchial), mmHg 70.5 ± 11.8
 Hypertension, n (%) 110 (32.7)
Urinalysis
 Cre, mg/dL 93.9 ± 63.9
 Na, mEq/L 102.8 ± 51.7
 K, mEq/L 49.9 ± 29.9
 Na/K ratio 2.60 ± 1.68
 Estimated daily salt intake, g 7.80 ± 2.20
Current RA therapeutics
 MTX use, n (%) 246 (73.2)
 Other cs DMARDs use, n (%) 116 (34.5)
 Biological agent use, n (%) 174 (51.8)
 PSL use, n (%) 70 (20.8)
  1. Continuous variables are presented as mean (± standard deviation) and categorical variables are presented as numbers (%). Data on RA-related parameters are expressed as median (range)
  2. Abbreviations: BMI body mass index, RF rheumatoid factor, anti-CCP antibody anti-cyclic citrullinated peptide antibody, CRP C-reactive protein, DAS28-ESR 28-joint disease activity score using erythrocyte sedimentation, HAQ health assessment questionnaire, Cre creatinine, eGFR estimated glomerular filtration, SBP systolic blood pressure, DBP diastolic blood pressure, Na sodium, K potassium, MTX methotrexate, csDMARD conventional synthetic disease modifying anti-rheumatic drugs, tsDMARD targeted synthetic DMARD, PSL prednisolone