After comparing various unequal countries and American states with more equal ones, the authors concluded that greater inequality leads to more crime, higher infant mortality, fatter citizens, shorter lives, more teenage pregnancies, more discrimination against women and so on.
Another concern is that women will push the age of motherhood to an extreme, endure more difficult pregnancies, risk premature labor and deny their children the chance of spending much, if any, time with their grandparents.
Dr Obel suspects the immediate cause is that male pregnancies are more likely to miscarry in response to stress than female pregnancies are, especially during the first three months.
ECONOMIST: The sex of a child may depend on how stressed its mother is
Likewise, older teens have a higher pregnancy rate, but that study also counted more than 110, 000 pregnancies among 15- and 16-year-olds in 2008 alone.
The number of multiple births in the UK was low - only just over a quarter of pregnancies resulted in more than one baby, whereas nearly half the successful fertility treatments in Spain resulted in a multiple delivery.
Farther down, the line "percentage of pregnancies with triplets or more" lets you know how often a clinic had a pregnancy with high-order multiples.
Guttmacher states that these women account for more than 80% of all unintended pregnancies in the developing world every year.
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This ageing of mothers means greater demands on maternity services as pregnancies to older women are more likely to involve complications, which demand more of midwives and others in the maternity team.
The rate of teenage pregnancies among under 16s in deprived areas was more than four times that in the least deprived.
Half the nation's pregnancies every year are unintended, and doctors' groups say more access to morning-after pills could cut those numbers.
Their published budgets reveal, at least, that more than 96% of all expenditures are not related to termination of medical pregnancies.
Yet 70 percent of pregnancies to women in their twenties are unplanned and, partly as a consequence, more than half of births to women under 30 occur outside of wedlock.
In a paper published last month in the Journal of the American Medical Association, he reported that this disorder, too, occurred more than twice as often in those whose mothers were starved in the early part of their pregnancies as in those whose mothers were (for wartime conditions) reasonably well-fed.
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