Objectives: To determine the prevalence of vitamin D deficiency (25-hydroxy vitamin D [25-OHD] levels in plasma 12 years old were more likely to have deficiency than patients 2 P value = .80, .34, and .22, respectively). Conclusions: The prevalence of vitamin D deficiency is high, but declined with time. Age, forced expiratory volume in 1 second, and season were associated with 25-OHD levels. Despite 33% of patients responding to 50 000 IU of ergocalciferol once a week, this recommendation does not adequately treat most patients with CF who have vitamin D deficiency.
ASJC Scopus subject areas
- Pediatrics, Perinatology, and Child Health