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

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

	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

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.

ISSN: 1478-6362