The second link is the more interesting one, with regards to this issue.
Take note of the graph looking at gender ratios by age brackets... By age 24 there are more females than males in the year 1990, by 34 in the year 2000. If you look at the distribution map, it doesn't match the so-called derived data in xoxo's map. Xoxo claims to be using census data, but that just doesn't make sense.
If there are n men and m women, and x are married, then n-x/m-x = the ratio of singles, male to female. Above 1 is male predominant, below 1 is female predominant.
Biologically, there are more males at birth, and this number drops over time. The death rate for men exceeds women throughout life, typically, after birth-mortality has improved with the advent of modern OBGYN.
Recent data has suggested that birth rates for males has decreased, and in some areas is now below 50% of live births, which reverses a well documented pattern over the last several hundred years (and probably before that, but accurate census data for pre-modern is hard to get). Some have hypothesized changes in stress patterns, environmental toxins, radiation as well as lifestyle pattern changes. Bottom line is unknown, but should the trend continue, overall oversupply of females may increase in the next generation.
Unless infant sacrifice becomes more mainstream, vis a vis PRC habits, that has approached a 54% male population ratio. Not good for societal stability, by the way...
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