We study the behavioral changes due to marijuana consumption on fertility and its key mechanisms, as opposed to physiological changes. We can employ several large proprietary data sets, including the National Longitudinal Survey of Youth, Nielsen Retail Scanner database, as well as the Vital Statistics Natality files and apply a differences-in-differences approach by exploiting the timing of the introduction of medical marijuana laws among states. We first replicate the earlier literature by showing that marijuana use increases after the passage of medical marijuana laws.
A new government report found that the US birth rate fell once again inand that Americans still aren't having enough babies to replace the current population. That's the number of expected births a group of 1, women would have during their lifetimes, according to current age-specific birth rates. In order to sustain a population, a country needs a total fertility rate of 2, births per 1, women, the report said.
PIP: As China's birth rate has declined, its birth gender ratio has increased. Sincetop leaders within the Party Central Committee and State Family Planning Committee have recognized publicly the serious issue of the birth gender ratio and called for action. Population researchers in the US and Australia have identified drowning of female infants as the main reason.
Abortion Rate The number of abortions per 1, women ages or in a given year. It is defined by the occurrence of any of more than 20 opportunistic infections or HIV-related cancers. Age-Dependency Ratio The ratio of persons in the ages defined as dependent under 15 years and over 64 years to persons in the ages defined as economically productive years in a population. Age-Sex Structure The composition of a population as determined by the number or proportion of males and females in each age category.
Sam Sanders. It feels like kind of, like, the Wild West. And it can often feel extremely time-consuming and unproductive, says Koch, a recent college graduate.
They killed landline phones. They destroyed movie rental stores. They even get flack for the decline in bar soap use.
In the human species the ratio between males and females at birth is slightly biased towards the male sex. This means that at birth on average, there are males for every females. Nature provides that the number of newborn males slightly outnumber newborn females because as they grow up, men are at a higher risk of dying than women not only due to sex differentials in natural death rates, but also due to higher risk from external causes accidents, injuries, violence, war casualties.
The ratio between the number of males and females in a society is referred to as the gender ratio. This ratio is not stable but instead shaped by biological, social, technological, cultural, and economic forces. And in turn the gender ratio itself has an impact on society, demography, and the economy.
Reuters Health - U. Across the country, government-funded abstinence-until-marriage education did not predict a reduction in teen births - and in conservative states, it was associated with higher adolescent birth rates, the study found. For the country as a whole, money spent on abstinence-only programs had no effect on adolescent birth rates, the researchers found.
In anthropology and demographythe human sex ratio is the ratio of males to females in a population. More data are available for humans than for any other species, and the human sex ratio is more studied than that of any other species, but interpreting these statistics can be difficult. Like most sexual species, the sex ratio in humans is approximately