2011 年 6 巻 p. 31-41
Objectives. To estimate the annual abnormality incidence proportions and annual continual abnormality proportions of blood constituents in order to examine the variability of blood characteristics during young adulthood.
Methods. We estimated the annual abnormality incidence proportions and annual continual abnormality proportions of blood constituents from 4th-year abnormality proportions of 1st-year abnormal subjects and from 4th-year abnormality proportions of 1st-year normal subjects. The estimation was performed only on items having 30 or more 1st-year abnormal subjects, using two calculation models.
Results. Model l, which assumed the coming and going of abnormal subjects, was more suited for the estimation than Model 2, which ignored coming and going. The blood constituents of university students had the following characteristics: i) 4th-year abnormality proportions were higher than 1st-year abnormality proportions for many items; however, except for serum protein and NF, the differences were not significant; ii) 4th-year abnormality proportions of 1st-year abnormal subjects, compared to 4th-year abnormality proportions of 1st-year normal subjects, were twice as high for low items and over 10 times as high for high items.
Conclusions The abnormality incidence proportions of blood constituents in university students were estimated to be 0.01-0.08, and the continual abnormality proportions were estimated to be approximately 0.5-0.8.
