A comparison of the copper T-200 and the Lippes Loop in four countries.

A comparative field trial of the Copper TCu-200 and the Lippes loop was conducted in Colombia, Iran, Korea, and Thailand from 1971 to 1973. The study, involving 7,400 women, provided two-year first segment continuation and termination rates. In three countries, TCu-200 expulsion rates were significantly below Lippes loop expulsion rates. For women with three or fewer living children, TCu-200 expulsion rates were markedly below Lippes loop rates in all four countries. The comparative advantage accruing to the TCu-200 in this characteristic did not extend to the two-year continuation rates.