Secular Changes in the Mean Birth Weight in Japan (On the Total Births, by Prefecture and Region)

Kahyo, Hiroaki; Doi, Tôru; Higa, Keiko; Yamashiro, Rumiko

doi:10.1265/jjh.32.543

Cited by 2 publications

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“…The UOEH Association of Health Sciences Kahyo (1977) reported that there were two types of the frequency tables in the Year Book of Hcalth Statistics of each prefecture in Japan, that is, one was the type used in the (Snedccor & Cochran, 1980) 3) A curi,e of norrnal distributien, 4) Source is the Vital Statistics ofJapan, Tables 383 of All Japan and typical communities at prefectural and HC levels (Fig, 2) Table 1 and SD is the mean of SD in Tab]e I. As n is suMciently large at the prefectural or the HC level, if IMBbt6)-itctBWQ Y SDiin+SDda }ll.96, then 1[():…”

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Changes of the Mean Birth Weight in Frequency Tables with Various Number of Classes

Doi

Kahyo

1983

J UOEH

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When the mean birth weights (MBW) calculated from frequency tables are compared with each other, the methods for grouping data into class intervals should be taken into consideration. We integrated the lower and/or upper classes of the frequency tables belonging to the type used in the Vital Statistics of Japan with 500 g intervals and 10 classes (less than or equal to 999, 1000-1499,..., 4500-4999, 5000 less than or equal to) into neighboring classes, and observed the differences between both MBW and the standard deviations (SD) calculated from the original standard frequency tables (o method) and those from the above modified ones (a,..., h method) at three community levels, namely, prefectural, health center (HC) and city-town-village level. At the prefectural level, MBW changed from -2 to 3 g through all the modified methods and SD changed most at -5 g in a,..., d method. At the HC level, MBW changed from -3 to -6 g and SD changed most at -8 g in a,..., d method. At the city-town-village level, MBW and SD did not change in over 50% of the communities, but the degrees of change were large in some communities where MBW or SD changed. The changes were larger in the case of integrating the lowest class into a class of less than or equal to 1499 g than that of integrating the highest class into a class of 4500 less than or equal to. Also they were larger in the case of integrating the lower two classes into a class of less than or equal to 1999 g than that of integrating the upper two classes into a class of 4000 g less than or equal to. We concluded that 1) MBW from the frequency tables where the lower classes were integrated should be carefully dealt with, especially at the small community level, but 2) the differences of population means between any method were not statistically significant and 3) if MBW from different frequency tables are compared with each other, reasonable differences of MBW depending on the methods of grouping and the size of the number of live births should be taken into account.

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Section: Nii-electronic Library Servicementioning

confidence: 99%

“…So positive health indicators such as physical status of schoolchiidren or the birth X･NThen the mean birth weights (MBXNJ) and the standard deviations (SD) are calculated fi/om frequency tables, )vlBW and SD may be influenced by a method of grouping birth weight data into ciasses, Kahyo (1977)…”

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Changes of the Mean Birth Weight in Frequency Tables with Various Number of Classes

Doi

Kahyo

1983

J UOEH

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Studies on growth and development in Japan

Kimura

1984

Am. J. Phys. Anthropol.

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Studies of growth and development in Japan since 1900 and especially after World War II are summarized in several topical areas: physical growth, development of physical fitness, longitudinal and allometric studies, dental development, skeletal maturation, studies of twins, growth of various groups of Japanese, i.e., Ainu children, children of Okinawa, Japanese Americans and Japanese‐American hybrids, and the secular trend. In general, Japanese growth and development are somewhat delayed compared to Americans and Europeans until childhood, but then develop more rapidly, reaching maturity at almost the same time. The secular trends for acceleration in growth and an increase in stature are observed in Japanese during these eight decades. More recently, the secular trends seem to be arriving at its final stage.

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Secular Changes in the Mean Birth Weight in Japan (On the Total Births, by Prefecture and Region)

Cited by 2 publications

References 1 publication

Changes of the Mean Birth Weight in Frequency Tables with Various Number of Classes

Changes of the Mean Birth Weight in Frequency Tables with Various Number of Classes

Studies on growth and development in Japan

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