claim: covid-19 mortality decreases with northerly latitude after adjustment for age suggesting a link with ultraviolet and vitamin d
evidence_1: view this table: view inline view popup table 1 associations between covid-19 mortality by country, latitude and % of population 65 years the proportion of older people in each country impacts greatly on covid-19 mortality, but after adjustment for this, a strong association remains across the northern hemisphere between latitude and higher covid-19 mortality.", "this analysis supports the link between latitude and covid-19 mortality reported within the usa by dr kohlmeier.1 evidence linking vitamin d deficiency with covid-19 severity is circumstantial but growing.", 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  "there are exceptions, but covid-19 mortality correlates with reported vitamin d levels across europe,7 and in sunnier brazil, where mortality is rising, 28% prevalence of vitamin d deficiency is reported.8 an association between vitamin d insufficiency and covid-19 severity is supported by substantial evidence of its impact on cytokine response to pathogens.7 a direct effect of ultraviolet light on the environmental survival of severe acute respiratory syndrome coronavirus 2 is also possible but would not explain the association between mortality and ethnicity,9 whereas people with dark skin need more ultraviolet exposure for equivalent vitamin d synthesis."
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  )