Table 2.
Relationship between low serum levels of vitamin D and clinical/serological manifestations of undifferentiated connective tissue disease patients
| Correlation between clinical symptoms and vitamin D insufficiency | P value | OD (95% CI) |
| Xerostomia/xerophtalmia | 0.8276 | 0.8909 (0.3768–2.107) |
| Polyarthritis | 0.4834 | 0.7621 (0.3772–1.540) |
| Skin lesion | 0.0046 | 2.987 (1.397–6.385) |
| Pleuritis | 0.0346 | 5.367 (1.078–26.719) |
| Central and peripheral nervous system manifestations | 1 | 0.8344 (0.1924–3.619) |
| Raynaud phenomenon | 0.5331 | 0.7407 (0.3178–1.726) |
| Oesophageal involvement | 0.3448 | 1.650 (0.6569–4.144) |
| Correlation between antibodies and vitamin D insufficiency | ||
| Anti-U1-ribonucleoprotein antibody | 0.0240 | 5.083 (1.286–20.094) |
| Anti-SSA antibody | 0.029 | 3.474 (1.147–10.520) |
| Anti-cyclic citrullinated peptide antibody | 0.0001 | 12.0 (3.541–42.036) |
| Anti-double-stranded DNA antibody | 0.2551 | 0.4896 (0.1751–1.369) |
| Anti-neutrophil cytoplasmic antibody | 0.2978 | 0.4024 (0.064–2.51) |
| Anti-cardiolipin antibody | 0.3728 | 1.715 (0.6535–4.501) |
| Anti-SSB antibody | 0.2945 | 0.5254 (0.1484–1.860) |
OD, Odds ratio; CI, confidence interval