At least on a percentage basis:
Census figures show only 57 percent of moms required to pay child support — 385,000 women out of a total of 674,000 — give up some or all of the money they owe. That leaves some 289,000 “deadbeat” mothers out there, a fact that has barely been reported in the media. That compares with 68 percent of dads who pay up, according to the figures….
The Census Bureau last month also released numbers showing fathers paid an average of $3,000 to custodial moms in 1997. Women paid little over half that. Moms also get about 60 percent of what they are owed, whereas dads only get 48 percent. Not only are the dads paying up more when they don’t have custody, but when the court does hand the kids over to dads, they work more than moms who have custody.
I’d heard this was true but I didn’t have any statistical evidence for it before. I would expect that whereas men who don’t make child support payments are subject to the modern form of debtor’s prison, very few, if any women are similarly incarcerated.