Average fixed mortgage rates in the U.S. edged up in the latest week, according to mortgage-finance company Freddie Mac (FMCC).

"Mortgage rates were little changed this week, entering April about where we started the year," Freddie Mac Deputy Chief Economist Len Kiefer stated Thursday.

Mr. Kiefer noted that the final fourth-quarter gross domestic product growth estimate was unchanged from a previous estimate for a 2.2% increase. Also, pending home sales rose 3.1% in February, beating expectations.

For the week ended Thursday, the 30-year fixed-rate mortgage averaged 3.7%, compared with 3.69% a week earlier and 4.41% a year earlier. Rates on 15-year fixed-rate mortgages averaged 2.98%, compared with 2.97% the previous week and 3.47% a year earlier.

Five-year Treasury-indexed hybrid adjustable-rate mortgages, or ARMs, on average, were at 2.92%, unchanged from the previous week and down from 3.12% a year earlier. One-year Treasury-indexed ARM rates on average were 2.46%, flat from the previous week and up slightly from 2.45% a year earlier.

Write to Tess Stynes at tess.stynes@wsj.com

Subscribe to WSJ: http://online.wsj.com?mod=djnwires