A measure of future U.S. economic growth fell in the latest week, and the annualized growth rate hit a 17-week low, a research group said on Friday.

The Economic Cycle Research Institute, a New York-based  independent forecasting group, said its Weekly Leading Index  fell to 121.3 in the week ended June 15 from 121.8 the previous  week. That was originally reported as 121.9.

The index's annualized growth rate decreased to -3.6 percent, the lowest rate since mid-February, from -3.0 percent a week earlier.