WASHINGTON (Reuters) - Programs teaching U.S. schoolchildren to abstain from sex have not cut teen pregnancies or sexually transmitted diseases or delayed the age at which sex begins, health groups told Congress on Wednesday.

The Bush administration, however, voiced continuing support for such programs during a hearing before a House of Representatives panel even as many Democrats called for cutting off federal money for so-called abstinence-only instruction.

“Vast sums of federal monies continue to be directed toward these programs. And, in fact, there is evidence to suggest that some of these programs are even harmful and have negative consequences by not providing adequate information for those teens who do become sexually active,” Dr. Margaret Blythe of the American Academy of Pediatrics told the committee.

These programs, backed by many social conservatives who oppose the teaching of contraception methods to teenagers in schools, have received about $1.3 billion in federal funds since the late 1990s. Currently, 17 of the 50 U.S. states refuse to accept federal funds for such programs.

Experts from the American Public Health Association and U.S. Institute of Medicine testified that scientific studies have not found that abstinence-only teaching works to cut pregnancies, sexually transmitted diseases or the age when sexual activity begins.

The American Psychological Association and American College of Obstetricians and Gynecologists also issued statements to the House Committee on Oversight and Government Reform criticizing the abstinence-only programs.

Comprehensive sex education programs should emphasize abstinence as the best way for a teenager to avoid pregnancy or a sexually transmitted disease (STD), Blythe said.

“Those adolescents who choose to abstain from sexual intercourse should obviously be encouraged and supported in their decisions by their families, peers and communities. But abstinence should not be the only strategy that is discussed,” Blythe said.

HIGH STD RATES

Lawmakers cited government statistics showing that one in four U.S. teenage girls has a sexually transmitted disease and 30 percent of U.S. girls become pregnant before the age of 20.

Republicans said even if some abstinence-only programs do not work, others do, and it would be wrong to end the funding.

Rep. John Duncan, a Tennessee Republican, said that it seems “rather elitist” that people with academic degrees in health think they know better than parents what type of sex education is appropriate. “I don’t think it’s something we should abandon,” he said of abstinence-only funding.

Charles Keckler of the U.S. Department of Health and Human Services said the Bush administration believes abstinence education programs send the healthiest message.

Stan Weed, director of the Institute for Research and Evaluation, a Utah-based group that researches abstinence programs, disagreed with the other health experts, saying research cast doubt on the effectiveness of broader, comprehensive sex education programs.

Panel chairman Rep. Henry Waxman, a California Democrat, said, “We are showering funds on abstinence-only programs that don’t appear to work, while ignoring proven comprehensive sex education programs that can delay sex, protect teens from disease, and result in fewer teen pregnancies.”

“Meanwhile, we have no dedicated source of federal funding specifically for comprehensive classroom sex education,” Waxman added.