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Table 4 Multivariate analysis for independent factors associated with DAS28-ESR

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

Dependent variables Independent variables Estimates Std. Error 95%CI P value
Lower Upper
DAS28-ESR Sex (male) −0.58 0.14 − 0.85 − 0.31 < 0.0001
Prednisolone (+) 0.48 0.12 0.23 0.72 0.0001
Urinary Na/K ratio 0.11 0.030 0.048 0.170 0.0004
Age (1 year) 0.0150 0.0046 0.0055 0.024 0.0016
RF (1 IU/mL) 0.00054 0.00019 0.00017 0.00091 0.0042
Biological agent (+) −0.23 0.098 −0.42 −0.033 0.021
Anti-CCP antibody (10 U/mL) 0.00 0.00 0.00015 0.0048 0.037
BMI −0.024 0.014 −0.050 0.0029 0.081
eGFR (1 ml/min/1.73m2) 0.0051 0.0030 −0.00084 0.011 0.092
Smoking (+) −0.18 0.19 −0.54 0.19 0.34
MTX (+) −0.0058 0.12 −0.23 0.22 0.96
  1. Results of multiple regression analysis adjusted for urinary Na/K ratio and other variables including sex, age, RF, anti-CCP antibody, smoking status, current therapeutics (the use of Methotrexate, Prednisolone, and biological agents), eGFR, and BMI
  2. Abbreviations: DAS28-ESR 28-Joint Disease Activity Score using erythrocyte sedimentation rate, RF rheumatoid factor, anti-CCP antibody anti-cyclic citrullinated peptide antibody, BMI Body mass index, eGFR estimated glomerular filtration, MTX methotrexate, CI confidence interval