(BSID-II) up to 3rd year
of life, Raven test in 5th and 8th year and Wechsler (WISC-R) in 6th and 7th year. Data on possible confounders
came from mothers’ interview, medical records and analyses of lead and mercury level at birth
and at the end of 5th year of life. Linear and logistic regression models adjusted for potential confounders
were used to assess the association.