男子高校生の肌着につく皮脂の量

抄録

Skin lipid stuck to the underwear worn by 26 senior high school boys for 24 hr under the ordinary living condition was extracted with benzene, and determined by the same method mentioned in the previous paper. The results are shown by mg stearic acid equivalent to skin lipid per 100 cm² of the cloth.
The results are outlined as follows :
1. The amounts of skin lipid on 16-17-year-old senior high school boys' underwear distribute widely ranging from 2.25 to 70.50 mg and the distribution has the mode at 13 mg. The skewness that indicates departure from the normal distribution of the data is +1.75.
2. The distribution range and the mode of the amounts of skin lipid on senior high school boys' underwear are about twice the width and the quantity of those of 13-14-year-old pupils', but they are very similar to those for women's college students'.
3. The amount of skin lipid on boys' underwear shows a rapid rate of increase during they grow to 16-17 years old from 13-14 years old.