Annual number of births, China, 1949-2011 2nd baby boom 3rd baby 30 1st baby bool boom 4th baby boom 已20 15
Annual number of births, China, 1949-2011 6 1st baby boom 2nd baby boom 3rd baby boom 4th baby boom ?
Crude birth rate in China, 1949-2008 一出生率 死亡率 —自然增长率 千分比 25 20 园虽過豆昌豆留蜜過画虽昌占昌過国盟器目菌喜 年份
Crude birth rate in China, 1949- 2008
Period measures 口 Crude birth rate a Simple to calculate a Influenced by the gender and age structure a Its denominator includes many people who are not at the risk of childbearing a such as young women(under age 15), postmenopausal women (older than age so)and men Example a 100 persons consisting of 10 women and go men, each woman gives birth to 1 child, CBR=? a 100 persons consisting of 5o women and 5o men, each woman gives birth to 1 child, CBR=?
Period Measures Crude Birth Rate Simple to calculate Influenced by the gender and age structure Its denominator includes many people who are not at the risk of childbearing ◼ such as young women (under age 15), postmenopausal women (older than age 50) and men Example 100 persons consisting of 10 women and 90 men, each woman gives birth to 1 child, CBR=? 100 persons consisting of 50 women and 50 men, each woman gives birth to 1 child, CBR=?
Period measures a General Fertility rate(GFR):(# Births /Mid year women aged15-49*1,000 口 Example:!US1940,1960,2000 1940 1960 2000 Live births 2.554.996 4250,7884,195,113 Women pop 36,081,000 41,601,000 71,781,000 15-49 GFR =(255499/360810×X10001022 70.8 a Influenced by age structure of reproductive women
Period Measures General Fertility rate (GFR): (# Births / Midyear women aged15-49) * 1,000 Example: US 1940, 1960, 2000 Influenced by age structure of reproductive women 1940 1960 2000 Live births 2,554,996 4,250,788 4,195,113 Women pop. 15-49 36,081,000 41,601,000 71,781,000 GFR =(2,554,996 / 36,081,000) X 1000 = 70.8 102.2 ?????
Period measure o Period Age-specific Fertility rate(aSFr): nBx/nWx 决1000 anB. number of births to women aged x to x+n in the given period a nWx: number of Women in the same specified age or age group in the given period n Eliminate the impact of gender and age structure of the population
Period Measure Period Age-specific Fertility rate (ASFR): nBx /nWx * 1,000 nBx : number of Births to Women aged x to x+n in the given period nWx : number of Women in the same specified age or age group in the given period Eliminate the impact of gender and age structure of the population