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measured by atomic absorption spectophotomery in 60 percent of the subjects. These included iron, calcium, lead, copper, zinc, magnesium, cadmium, sodium and potassium. Only the plasma iron values will be presented here. The remaining trace mineral data have been accepted for publication. ( )
ANALYSIS OF DATA:
In order to set the stage for the more detailed consideration of our mothers nutritional status as they entered our prenatal care system a short summation of pertinent related social, economic, educational and health practices of these 550 high risk young women is necessary.
1. What are their chronological, biologic and prior reproductive characteristics?
The mean age of onset of menses was 12.3 years. The percent of our patients whose age at time of onset of menarche was:
| Less than 10 years | - | 2 | percent |
| Less than 11 years | - | 8 | percent |
| Less than 12 years | - | 27 | percent |
| Less than 13 years | - | 56 | percent |
| Less than 14 years | - | 83 | percent |
| Less than 15 years | - | 94 | percent |
| Less than 16 years | - | 98 | percent |
In 10 percent, menarche had occurred prior to their eleventh year and 6 percent after their 15th year. The mothers age at the time of delivery ranged from 13 through 19 years of age. The age breakdown of these young women yielded the following percent in each age group:
| Less than 13 years of age: | 0 | percent |
| Less than 14 years of age: | 1 | percent |
| Less than 15 years of age: | 4 | percent |
| Less than 16 years of age: | 11 | percent |
| Less than 17 years of age: | 27 | percent |
| Less than 18 years of age: | 49 | percent |
| Less than 19 years of age: | 75 | percent |
| Less than 20 years of age: | 100 | percent |
Approximately equal quartiles delivered prior to their 17th birthday, and during their 17th, 18th, and 19th years. Actual delivery occurred an average of 5.8 years after the menarche. In 19-percent the termination of 'pregnancy was less than 3 years after menarche. The detailed distribution of percent
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Source: https://www.industrydocuments.ucsf.edu/docs/hqvd0227