Mitt Romney has come up with an “amazing statistic” and Republicans inside and outside his presidential campaign are doing their utmost to spread it around: “92.3 percent of all the jobs lost during the Obama years have been lost by women.”

Amazing it may be. As a meaningful measure of Obama’s economic record and its effect on women, though, it is dubious at best.

Romney’s math is solid as far as it goes. But more men than women have lost jobs since the recession began — that’s why economists called it a “man-cession.”

In blaming Obama for “turning the clock back 20 years on American women,” as the Romney campaign puts it, Republicans are hoping to counter Obama’s perceived advantage with female voters. But they ignore how recessions generally — and the last one in particular — unfold, and they hold Obama accountable for the state of the economy from the time he took office, before his policies could make any difference.