The screening suggests that in 2000, 19 percent of all newborn babies in Metropolitan France had at least one parent originating from one of the risk regions. The figure for 2007 was 28.45 percent, for 2010 31.5 percent, for 2012 34.44 percent, for 2013 35.7 percent, and for 2015 38.9 percent. These percentages vary widely among French regions; for example, in 2015, screening suggested that only 8.1% of children born in Brittany had a parent originating from a sickle-cell risk region, while 73.4% of children born in Île-de-France (which includes Paris) did. The percentage for Île-de-France was a significant increase from 54.2% in 2005. However, a 2014 story in Le Monde suggested that the testing figures for Île-de-France were distorted by the practices of some hospitals in the region, which choose to test all babies whether or not they have parents with ancestry from an endemic sickle-cell region.. What disease do these statistics track?