Table 1

Seasonal fluctuation of the levels of vitamin D in patients with undifferentiated connective tissue disease

UCTD patients

Summer

n = 161

UCTD patients

Winter

n = 161

Control

Summer

n = 59


Vitamin D insufficiency (<30 ng/mL)

67 patients (41.6%)

21.0 ± 5.79a

88 patients (54.3%)

18.4 ± 6.7b

11 (18.64%)

25.0 ± 4.65c


Vitamin D deficiency (<10 ng/mL)

5 (3.1%)

(1 RA, 4 UCTD)

5 (3.1%)

(2 RA, 3 UCTD)


Significance: a-csummer-control: P = 0.14; b, cwinter-control: P = 0.016; a, bsummer-winter: P = 0.03. RA, rheumatoid arthritis; UCTD, undifferentiated connective tissue disease.

Zold et al. Arthritis Research & Therapy 2008 10:R123   doi:10.1186/ar2533

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