The initial assessment was conducted at age 3 years and every 2 years to age 15 years, and then at ages 18, 21, 26, and 32 years, when 972 participants — 96% of living cohort members — were assessed.

初始的评估是在受试者3岁那年进行的，自此以后每两年进行一次，直到他们15岁为止，然后分别在受试者18，21，26和32岁时进行测试，活着的队列成员中有96%—972名受试者接受了评估。