highly significantp < 0.001
There was also a significant statistical difference between study groups as regards AST and ALT ( p < 0.052 and p < 0.027, respectively), in addition to a highly significant statistical difference among study groups as regards vitamin D levels ( p < 0.001), where a significant decline in mean vitamin D levels was noticed in ICU patients compared to ward patients (18.3 ± 4.8 vs 23.1 ± 3.9) (Table 2 ).