A nationwide study has good news for women undergoing test-tube fertility procedures. Researchers say 12 years of data show complications including deaths are uncommon from procedures that include IVF.

The most common problems are related to drugs used to stimulate ovaries in preparation for in vitro fertilization. Over-stimulation is a risk and it occurred in 154 out of every 10,000 pregnancy attempts studied.

Other complications were less than 10 per 10,000 attempts. There were 58 deaths reported during the 2000-11 study. But the authors say the results are reassuring, given there were more than 1 million pregnancy attempts using IVF during the study.

The study is the first large-scale effort to quantify risks for U.S. patients undergoing these treatments. Results appear in Tuesday's Journal of the American Medical Association.