手法を比較

	Tempo-Adjusted Fertility	Mean Age at Childbearing
分野	人口学	人口学
系統	Process / pipeline	Process / pipeline
提唱年	1998	1968
提唱者	John Bongaarts & Griffith Feeney	Standard demographic practice (fertility schedule moments)
種類	Tempo-and-quantum adjustment of the period total fertility rate	Summary location measure of the age pattern of fertility
原典	Bongaarts, J., & Feeney, G. (1998). On the quantum and tempo of fertility. Population and Development Review, 24(2), 271–291.	Preston, S. H., Heuveline, P., & Guillot, M. (2001). Demography: Measuring and Modeling Population Processes. Blackwell. ISBN: 9781557864512
別名	Bongaarts-Feeney adjustment, Tempo-adjusted TFR, Quantum-tempo decomposition of fertility, Tempo Düzeltmeli Doğurganlık	MAC, Mean age of the fertility schedule, Mean age of mothers at birth, Ortalama Doğurganlık Yaşı
関連	4	4
概要	Tempo-adjusted fertility is the Bongaarts-Feeney correction of the period total fertility rate that removes the distortion introduced when the timing of childbearing changes. When women collectively postpone (or advance) births, the conventional period total fertility rate is artificially depressed (or inflated) even if the number of children women ultimately have is unchanged; the adjustment inflates each birth-order-specific rate by a factor based on the changing mean age at childbearing to recover an undistorted measure of fertility quantum.	The mean age at childbearing is the average age of mothers at the birth of their children, computed as the fertility-rate-weighted mean of maternal age over the age-specific fertility schedule. As the first moment of the fertility curve, it summarizes the tempo — the timing — of childbearing in a single number, complementing the total fertility rate, which measures quantum, or how many children are born.