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Table 3 Correlations between the natural logarithm of 25(OH)D (Ln 25(OH)D) and several continuous variables in patients not taking vitamin D supplements

From: Vitamin D deficiency in rheumatoid arthritis: prevalence, determinants and associations with disease activity and disability

  Correlation coefficients (95% C.I.) Regression Coefficients (r) P
Ln PTH pg/ml -0.076 (-0.121, -0.031) 0.114 0.031
BMI (kg/m2) -0.015 (-0.022 , -0-007) 0.135 <0.001
Swollen joints count -0.009 (-0.017, -0.002) 0.087 0.121
DAS28 -0.091 (-0.129, -0.052 0.191 <0.001
HAQ score -0.101 (-0.140, -0.062) 0.175 <0.001
ADL -0.027 (-0.038, -0.016 0.165 <0.001
  1. Abbreviations: 25(OH)D, 25-hydroxyvitamin D; ADL, activities of daily living; BMI, body mass index; DAS 28, Disease Activity Score 28; HAQ, Health Assessment Questionnaire Disability Index; Ln PTH, natural logarithm of parathyroid hormone.