Keep in mind: * The total number of patients in the entire study was 20. * The number of ICU patients was 13. * The number of ICU patients younger than 75 ye

Keep in mind: * The total number of patients in the entire study was 20. * The number of ICU patients was 13. * The number of ICU patients younger than 75 years was 10. It's interesting that 10 out of 10 patients in the ICU had low vitamin D, but it's not exactly a huge study.