Abstract
Early studies of a few subjects suggested that intestinal alkaline phosphatase (IAP) activities in children 5 years of age or less were higher than in older individuals. To further investigate this finding, the IAP and disaccharidase activities of 298 subjects (133 were 5 years of age or less) with normal intestinal histology were assayed. Ninety-five of the children had serum alkaline phosphatase determined. The youngest individual with a low lactase activity was 5 years of age, which supported the earlier findings. When the whole population was tested, there was no correlation between the intestinal and serum alkaline phosphatase values. The mean IAP activity of subjects 1 year old and less was greater than in older individuals, but there was greater statistical dispersion and the data were not normally distributed. When studying the natural logarithm of the data, a wide dispersion of values about the mean in the 0 to 3 year-old age group was observed. This qualitative behavior is characteristic of functions involving the base of the natural logarithm and of processes that "age" in a simple way.
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