1973 年 24 巻 4 号 p. 293-296
Skin lipid stuck to the underwear worn by 37 pupils of a junior high school and 13 students of a women's college for 24 hr under the ordinary living condition was extracted with benzene, and determined by the monomolecular surface lens method presented by T. Tachibana and his coworkers. 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 distribution of the amount of skin lipid stuck to the underwear worn by 13-14-year-old pupils has the mode at 5 mg. The skewness that indicates departure from the normal distribution of the data is +1.8.
2. The distribution range of the amounts of skin lipid on boys' underwear is slightly wider than that of girls', but both distributions for boys and girls aged 1314 years have the modes at 5 mg, and the general picture of the two distributions are approximately the same.
3. The amounts of skin lipid on underwear worn by college students distribute considerably widely ranging from 4.31 to 61.38 mg. This distribution has the mode at 11 mg.
4. Up to the age of 22, the more the age advances, the more skin lipid is found on the underwear.