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Table 1 Seasonal fluctuation of the levels of vitamin D in patients with undifferentiated connective tissue disease

From: Vitamin D deficiency in 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)
 
  1. 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.