The author worked for 4 months, as a statistician, in the department of the the vital statistics of the Model Health Center of Kanagawa Prefecture The purpose of his work was to find some interesting problems in vital statistics available in the Health Center. The author could find following problems and studied them in detail during this period. 1. How exactly the registration of V.D. and T.B. was? 2. From where wives came to marry to husbands who were burn in Kanagawa prefecture? Comparing present and past materials the author could find the percentage of the wife born in -Kanagawa prefecture reduced to fifty-three per cent at present from eighty-seven per cent in the past. 3. The percentages of birth and death of residents in Kanagawa Prefecture who have “Honseki” in other prefectures. He estimated them four to five per cent.
Analyzing the number of deaths from Influenza in the past the author noticed : 1. Age distribution and the seasonal variation during the pandemic of 1918-20 much differed from those of other years. 2. The onset of the pandemic was in September in south and west part of Japan, and October in north and east part, showing clearly the rapid spreading of this disease.
The author measured the girth of upper arm of the 1110 repatriates from Kita Ooagari Island and South Manchuria, and of 497 natives of Okinawa Islands repatriated from Japan. He compared their mean values of different districts each other, and he also compared them with that of general Japanese people reported before the war. He noticed that the girth of upper arm of repatriated people was less than that of general Japanese.