Worldwide vitamin D status.

By N. V. van Schoor, P. Lips. Best practice & research. Clinical endocrinology & metabolism, 2011

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Vitamin D for Health: A Global Perspective (2013, positive): “1,2,7 In a study on the vitamin D status of Australian adults, vitamin D deficiency (25[OH]D <20 ng/mL) was 31% (22% in men and 39% in women); 73% had 25(OH)D levels less than 30 ng/mL.(226) Women who practice purdah (ie, the use of clothing and other approaches to screen themselves from men and str”
Vitamin D: An overview of vitamin D status and intake in Europe (2014, background): “Studies and reviews (Mithal et al. 2009; Van Schoor & Lips 2011) often report a north–south gradient in Europe, with Scandinavian countries generally showing higher values for circulating 25(OH)D than in Southern Europe.”
Vitamin D deficiency in Europe: pandemic? (2016, background): “Calls have been made to use centralized laboratories to make an international comparison of serum 25(OH)D and vitamin D deficiency prevalence estimates more reliable (11), but this approach might not be feasible, given existing national structures and systems.”
Vitamin D deficiency is a major global public health problem (2014, neutral): “tener una fuente disponible para todos, varios estudios han determinado deficiencia de vitamina D a nivel mundial (5-7), encontrando que los niveles de 25(OH) D son bajos en la mayoría de los países, particularmente en los países del Medio Oriente y en Asia.”