Clinical aspects and surgical treatment of thymoma

25-hydroxycholecalciferol (25(OH)D ₃) and other parameters of vitamin D nutriture were studied in 96 residents of two homes for the aged in Jerusalem, which differed in economic level. Mean 25(OH)D ₃ levels of the inhabitants of the home with the higher economic level were higher than those of residents of the other home. Housebound subjects tended to have lower values than those who were free-moving, free-living and their serum phosphorus and calcium-phosphorus product were lower. Serum 25(OH)D ₃ was closely correlated with serum phosphorus and the calcium-phosphorus product, but not with alkaline phosphatase activity. Judged by serum 25(OH)D ₃ levels, vitamin D nutriture of the inhabitants of the home with the higher economic level was apparently superior to that of the residents of the other home and particularly to that of the housebound subjects in the latter home.