In comparison, the potential exposure to BPA from use of dental sealants on a child of average weight, based on the assumptions above, is 0.037 milligrams per kilogram of body weight. This exposure level is more than 50,000 times lower than the LD50 values that have been reported for BPA.
U.S. expectancy in 2011 was 78.7 years, which is slightly below the OECD average of 80.1. For U.S. men, the average life expectancy is 76, while it's 81 for U.S. women. (At five years, this gap in life expectancy between men and women is smaller than the OECD average of six years). The U.S. life expectancy comes in just behind Slovenia, at 80.1 years, and Denmark, at 79.9 years.
In the 1990âs, when the U.S. study was conducted, the average age of an American girlsâ first menstruation is similar to what it was a generation ago: 12.1 years old for African Americans and 12.8 for white girls. The average age for beginning menarche dropped 3.5 months from 1991 to 2006 for the Danish girls.