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J Pediatr. 2009 Aug;155(2):260-5. doi: 10.1016/j.jpeds.2009.02.033. Epub 2009 May 15.

Hypovitaminosis D is associated with greater body mass index and disease activity in pediatric systemic lupus erythematosus.

Author information

  • 1Department Of Pediatrics, Division of Rheumatology, University of Texas Southwestern Medical Center, Dallas, TX, USA. tracey.wright@utsouthwestern.edu

Abstract

OBJECTIVES:

To determine whether pediatric systemic lupus erythematosus (SLE) is associated with alterations in the vitamin D-parathyroid hormone (PTH) axis and to assess the relation between vitamin D deficiency and SLE activity.

STUDY DESIGN:

25-hydroxy vitamin D [25(OH)D], 1,25-dihydroxy vitamin D [1,25(OH)2D], and intact PTH were measured in subjects with SLE (n = 38) and healthy controls (n = 207), ages 5 to 21 years. Vitamin D status and its relation with disease activity were assessed using multivariable logistic and linear regression.

RESULTS:

Severe vitamin D deficiency (25(OH)D <10 ng/ml) was observed in a significantly higher proportion of subjects with SLE (36.8% vs 9.2%, P < .001). In SLE, the odds ratio (OR) for severe deficiency was 2.37 (P = .09), adjusting for age, sex, race, and season. However, for each 1 SD greater body mass index (BMI) z-score, 25(OH)D levels were 4.2 ng/mL lower (P = .01) in SLE, compared with controls. Adjusting for 25(OH)D levels, SLE was associated with significantly lower 1,25(OH)2D (P < .001) and intact PTH levels (P = .03). Greater SLE disease activity index scores were observed in those with 25(OH)D <20 ng/mL (P = .01).

CONCLUSIONS:

SLE was associated with vitamin D deficiency, particularly among those subjects with SLE who were overweight. Future studies should assess the effect of vitamin D supplementation on skeletal and nonskeletal outcomes in SLE.

PMID:
19446841
[PubMed - indexed for MEDLINE]
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