<P> One study from Sweden (2008 - 2010) showed that the prevalence of unintended pregnancies was 23.2% . One study conducted in Uppsala (2012 - 2013) found that 12% of pregnancies were fairly or very unplanned . </P> <P> According to a 2004 study, current pregnancies were termed "desired and timely" by 58% of respondents, while 23% described them as "desired, but untimely", and 19% said they were "undesired". </P> <P> The United States rate of unintended pregnancies is higher than the world average, and much higher than that in other industrialized nations . Almost half (49%) of U.S. pregnancies are unintended, more than 3 million unintended pregnancies per year . </P> <P> A 2011 study by the Guttmacher Institute based on data from the Centers for Disease Control and Prevention and other sources determined that the average U.S. rate of unintended pregnancies was 51 per 1,000 women ages 15 to 44 in 2006 . Most states' rates were between 40 and 65 unintended pregnancies per 1,000 women . The state with the highest rate of unintended pregnancies was Mississippi, 69 per 1,000 women, followed by California, Delaware, the District of Columbia, Hawaii and Nevada (66 to 67 per 1,000). New Hampshire had the lowest rate, 36 per 1,000 women, followed by Maine, North Dakota, Vermont and West Virginia (37 to 39 per 1,000 women). </P>

What is the proportion of unplanned pregnancies in the us