WASHINGTON  Lenders are ramping up efforts to avoid home foreclosures, but a report by bank regulators says more than half of borrowers who get help fall behind again. More than 50% of homeowners with loans modified in the first half of last year had missed at least two months of payments a year later, the federal Office of the Comptroller of the Currency and the Office of Thrift Supervision said Wednesday. RELATED: Many mortgage modifications push payments .... higher But the results were better among those who saw their payments drop substantially. About one in three borrowers whose monthly payments were reduced 20% or more had fallen behind again within a year. That compares with more than 60% for borrowers whose loan payments were left unchanged or increased. The report highlights a significant challenge for the Obama administration's plan to tackle the foreclosure crisis, backed by $50 billion in money from the financial industry bailout fund. High rates of redefault have typically plagued loan modification programs, and critics argue that there is little point to modify loans that will fall into trouble again. Officials in the Obama administration, however, counter that their plan requires the lending industry to make far more substantive changes — for example, reducing a borrower's interest rate to as low as 2% — than was common in the past. The administration's effort got off to a slow start, but has picked up speed in recent months. As of last month, about 360,000 borrowers, or 12% of those eligible, have signed up for three-month trial modifications. They are supposed to be extended for five years if the homeowners make their payments on time. There is currently no data on redefaults within the plan. Traditionally, most lenders have offered payment plans that allowed borrowers to catch up on missed payments. But those modifications often do not involve an interest rate reduction and result in a higher monthly payment. But the bank regulators' quarterly report shows that lenders were shifting their focus to modifications that reduced borrowers payments. They made up nearly 80% of new modifications in the April-June quarter, up from about half in the first three months of the year. The report covers 34 million loans, representing more than 60% of primary home mortgages. Consistent with other reports, it showed borrowers are continuing to fall behind as job losses mount. More than 11% of borrowers covered by the report had missed at least one payment as of June 30, up from 10% in April. It also highlighted mounting problems with an especially troubling category of loans — "pick-a-payment" or option ARM loans, which allowed borrowers to defer some of their interest payments and add them to the principal. At the end of June, 10% of these loans were in foreclosure, more than triple the rate for all mortgages in the survey. Copyright 2009 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed. Guidelines: You share in the USA TODAY community, so please keep your comments smart and civil. Don't attack other readers personally, and keep your language decent. Use the "Report Abuse" button to make a difference. You share in the USA TODAY community, so please keep your comments smart and civil. Don't attack other readers personally, and keep your language decent. Use the "Report Abuse" button to make a difference. Read more