Affected by social factors such as delays in the age of first marriage, the total fertility rate of women of childbearing age continued to decline in 2021.
So it's actually a shift, then, that happens in advising scientists that are doing biomedical research, don't study women of reproductive age out of a good heart, right?
The number of women of childbearing age in China decreased by about 5 million in 2021 compared with 2020, among which women aged 21 to 35 decreased by about 3 million.
When women of reproductive age started to be vaccinated in large numbers in the (northern) summer of 2021, some noticed that their periods following vaccination were later than normal.
Behind the slowdown in population growth was the continued decline in births, as a result of a decline in the number of women of childbearing age as well as a decline in fertility levels.
Though Americans still chowed down on about the same amount of fish between 1999 and 2010, blood levels of mercury in women of childbearing age appear to have dropped 34 percent during that time.
At the moment, to limit the risk of miscarriage and harm to fetuses during a vaccine trial, it is standard practice for women of reproductive age participating in such trials to be using birth control.
The total fertility rate, which is a projected estimate of the number of children an average woman of childbearing age will have over her lifetime, has been declining for most countries for a while now.
But even If we look at the total fertility rate, that has also gone down, from 68.4 births per 1000 women of childbearing age in 1980, to 62.5 births per 1000 women of childbearing age in 2015.