IQ- tests of the children with lower than normal school performance.
Number of cases
Data obtained: N = 495
Questionnaire form (in finnish)
The variable list (in finnish)
IQ-test of 449 children who were at lower level at school than normal at age 14 y.
Rantakallio P., von Wendt L.: Mental retardation and subnormality in a birth cohort of 12,000 children in Northern Finland. Am. J. Ment. Defic. 1986, 90: 380-387.
Last updated: 10.7.2020