Actually, the statistics are about single mothers. Not divorced mothers. And not widowed mothers. Just mothers who didn't bother getting married before getting pregnant/having children.
Here's an excerpt from that chapter:
"Here is the lottery ticket that single mothers are handing their innocent children by choosing to raise them without fathers: Controlling for socioeconomic status, race, and place of residence, the strongest predictor of whether a person will end up in prison is that he was raised by a single parent. By 1996, 70% of inmates in state juvenile detention centers serving long-term sentences were raised by single mothers. 72% of juvenile murders, and 60% of rapist come from single-mother homes. 70% of teenage births, dropouts, suicides, runaways, juvenile delinquents, and child murderers involved children raised by single mothers. Girls raised without fathers are more sexually promiscuous and more likely to end up divorced. A 1990 study by the Progressive Policy Institute showed that after controlling for single motherhood, the difference between black and white crime rates disappeared.....According to the Index of Leading Cultural Indicators, children from single-parent families account for 63% of all youth suicides, 70% of all teenage pregnancies, 71% of all adolescent chemical/substance abuse, 80% of all prison inmates, and 90% of all homeless and runaway children. "