The following reference ensures statistics of other countries worldwide, rather than just the United States.
At the 2013 census, 17.8% of New Zealand families were single-parent, of which five-sixths were headed by a female.
Single-parent families in New Zealand have fewer children than two-parent families; 56% of single-parent families have only one child and 29% have two children, compared to 38% and 40% respectively for two-parent families.
Countries in Asia and the Middle East are the least likely to have children raised in single parent households.
On the other hand, the 3 areas of the world that are most likely to have non-marital childbearing are Latin America, South Africa, and Sweden.
Along with this, the areas where there are an extremely high number of children living in single parent homes include Africa, Europe, Latin America, North America, and Oceania.
It has also been shown that children living in areas of South Africa are the very most likely to live with a single parent.
Single parenthood has been common historically due to parental mortality rate (due to disease, wars and maternal mortality).
Historical estimates indicate that in French, English, or Spanish villages in the 17th and 18th centuries at least one-third of children lost one of their parents during childhood; in 19th-century Milan, about half of all children lost at least one parent by age 20; in 19th-century China, almost one-third of boys had lost one parent or both by the age of 15.
The Institute for the Study of Civil Society reports that children of single parents, after controlling for other variables like family income, are more likely to have problems.