The stricter lending standards are the fallout from the subprime mortgage market meltdown. About 15 percent of mortgage borrowers are in the subprime category. Those are the least creditworthy people, with credit scores less than 620 (on a scale of 300 to 850). About 85 percent of mortgage borrowers have credit scores of 620 or higher. So far — knock on wood — most of these prime customers needn’t worry about being turned down for home loans on the basis of their riskiness as borrowers, so long as they’re willing to let the lender verify their incomes and assets.