crooked-v says: "12 out of all soldiers may not be a lot, but 12 out of 38 certainly is." If the 38 were a random sample then finding that 12 of the 38 had hig

crooked-v says: "12 out of all soldiers may not be a lot, but 12 out of 38 certainly is." If the 38 were a random sample then finding that 12 of the 38 had high lead levels would indeed be alarming and call for further study. But it appears those were persons already suspected of having problems. In contrast the article at https://www.nytimes.com/2019/04/03/magazine/lead-poisoning-military-soldiers.html https://www.nytimes.com/2019/04/03/magazine/lead-poisoning-m... reveals: "The Department of Defense, which until last year annually tested blood lead levels in just 1,200 out of almost three million troops and civilian employees, has found very few cases of lead poisoning, leading Army officials to believe that there isn’t a widespread problem."