WASHINGTON  Infant deaths in the United States declined 2 percent in 2006, government researchers reported Wednesday, but the rate still remains well above that of most other industrialized countries and is one of many indicators suggesting that Americans pay more but get less from their health care system.

Infant mortality has long been considered one of the most important indicators of the health of a nation and the quality of its medical system. In 1960, the United States ranked 12th lowest in the world, but by 2004, the latest year for which comparisons were issued by the Centers for Disease Control and Prevention, that ranking had dropped to 29th lowest.

This international gap has widened even though the United States devotes a far greater share of its national wealth to health care than other countries. In 2006, Americans spent $6,714 per capita on health  more than twice the average of other industrialized countries.

Some blame cultural issues like obesity and drug use. Others say that the nation’s decentralized health care system is failing, and some researchers point to troubling trends in preterm births and Caesarean deliveries.