A 2002 study of planned home births in the state of Washington found that home births had shorter labors than hospital births. In North America, a 2005 study found that about 12 percent of women intending to give birth at home needed to be transferred to the hospital for reasons such as a difficult labor or pain relief. A 2014 survey of American home births between 2004 and 2010 found the percent of women transferred to a hospital from a planned home birth after beginning labor to be 10.9%.