Related Experiment Video
Updated: Jan 2, 2026
05:42
Z-Scores for Assessing Ovarian Reserve in Young Patients Undergoing Fertility Preservation
Published on: October 25, 2024
1.5K
An assessment of China's fertility level using the variable-r method
1Department of Sociology, University of Utah, Salt Lake City, UT 84112-0250, USA. yong.cai@soc.utah.edu
Demography
|July 11, 2008
Summary
China's fertility rate is below replacement levels, according to a study using the variable-r method. Data from 1990 and 2000 censuses confirm these findings on Chinese population trends.
Area of Science:
- Demography
- Population Studies
- Sociology
Background:
- Fertility levels in China have been subject to significant debate and uncertainty.
- Accurate assessment of fertility is crucial for population policy and socioeconomic planning.
Purpose of the Study:
- To apply the variable-r method to estimate China's fertility level.
- To resolve controversies surrounding current Chinese fertility rates.
Main Methods:
- Utilized the Preston and Coale (1982) variable-r method.
- Employed data from China's 1990 and 2000 population censuses.
- Incorporated data from annual population change surveys.
Main Results:
- The variable-r method confirmed fertility levels well below the replacement rate.
- Analysis indicates a sustained trend of sub-replacement fertility in China.
Conclusions:
- China's fertility rate has fallen significantly below the replacement level.
- The findings provide empirical evidence to address the uncertainty surrounding Chinese fertility.
More Related Videos
Related Concept Videos
01:29Life Histories
22.4K
Overview
22.4K
01:52Regression Toward the Mean
6.8K
Regression toward the mean (“RTM”) is a phenomenon in which extremely high or low values—for example, and individual’s blood pressure at a particular moment—appear closer to a group’s average upon remeasuring. Although this statistical peculiarity is the result of random error and chance, it has been problematic across various medical, scientific, financial and psychological applications. In particular, RTM, if not taken into account, can interfere when...
6.8K
01:21Friedman Two-way Analysis of Variance by Ranks
459
Friedman's Two-Way Analysis of Variance by Ranks is a nonparametric test designed to identify differences across multiple test attempts when traditional assumptions of normality and equal variances do not apply. Unlike conventional ANOVA, which requires normally distributed data with equal variances, Friedman's test is ideal for ordinal or non-normally distributed data, making it particularly useful for analyzing dependent samples, such as matched subjects over time or repeated measures...
459
01:23Infertility in Males
492
Male infertility affects millions of couples worldwide, arising from various factors that impact different stages of the reproductive process. An endocrine imbalance resulting from conditions like hypogonadism, Klinefelter syndrome, or pituitary disorders can disrupt hormone levels and reduce sperm production. Testicular defects, such as tumors, cryptorchidism, atrophic testes, abnormal sperm morphology, and low sperm count or motility, may arise due to genetic factors, structural...
492
02:45The Ratio of X Chromosome to Autosomes
9.3K
In most organisms, sex is determined by the ratio of X and Y chromosomes. However, in some organisms, such as Drosophila and C.elegans, sex is determined by the ratio of the number of X chromosomes to the number of sets of autosomes. The Y chromosome in Drosophila is active but does not determine sex. It contains genes responsible for the production of sperms in adult flies.
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female...
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female...
9.3K
02:01Factorial Design
13.6K
Factorial Analysis is an experimental design that applies Analysis of Variance (ANOVA) statistical procedures to examine a change in a dependent variable due to more than one independent variable, also known as factors. Changes in worker productivity can be reasoned, for example, to be influenced by salary and other conditions, such as skill level. One way to test this hypothesis is by categorizing salary into three levels (low, moderate, and high) and skills sets into two levels (entry level...
13.6K