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American Journal of Clinical Nutrition, Vol 13, 173-185, Copyright © 1963 by The American Society for Clinical Nutrition, Inc.

Nutrition and Growth of Iowa School Girls

Mixed Longitudinal Data

CHARLOTTE E. RODERUCK PH.D.1

1 Professor, Food and Nutrition Department, College of Home Economics, Iowa State University, Ames, Iowa

Mixed longitudinal data on growth and maturation have been obtained from about 200 girls in one county in Iowa. Heights, weights and serum alkaline phosphatase activity have been presented by age. In general, these girls were about the same average height as Iowa girls measured in the 1930's but their weight was greater. Compared with populations of girls on the east and west coasts of the United States, girls from Iowa were apt to be heavier for their height. Serum alkaline phosphatase activity reflected rate of increases in height; those girls who were "advanced" in skeletal age over their chronological age grew faster at an earlier age, and their serum alkaline phosphatase decreased earlier than their age-mates whose skeletal age was "normal."

The average chronological age for menarche of 179 girls in this study was 12.75 years; however, the median skeletal age at menarche was 13.0 and 13.3 years for the girls who were classified "normal" and "advanced" on the basis of roentgenograms of the bones in both hands.

Variation in the values for serum alkaline phosphatase activity has been examined for observations made within six months of each girl's birthday. The mean maximal difference between replicate observations was about 1.5 nitrophenol units, with a standard deviation of about 1.0 nitrophenol unit.

Hemoglobin concentrations, although exhibiting variations, were satisfactory for this population of Iowa girls. Serum concentrations of vitamin C indicated that nutrition with respect to this nutrient was improved over that observed for Iowa girls participating in a survey several years earlier. Less than 15 per cent of the girls in the present study had serum vitamin C values consistently or frequently below 0.4 mg. per cent.






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Copyright © 1963 by The American Society for Nutrition