Vitamin D and Chronic Pain in Immigrant and Ethnic Minority Patients—Investigation of the Relationship and Comparison with Native Western Populations
25-OH vitamin D levels in pain subjects and nonpain controls according to latitude (northern or southern hemisphere). White circles indicate pain subjects from the general Western population; black circles indicate nonpain (control) subjects from the general population. Red circles show data for pain subjects from immigrant/ethnic minority populations and the blue circle is from an ethnic minority nonpain control population. The size of the symbol is proportional to the size of the study populations (inset logarithmic scale).