For those without special accommodations, one finds no gains in verbal scores and just a 0.1 standard deviation gain in math scores over this period of time. (educationnext.org)
These families experienced statistically significant positive effects on their children's home learning environment and on the child's IQ and verbal scores when compared with families who were not offered services. (pewtrusts.org)
Results from global and verbal scores of cognitive tests at military conscription (mandatory for all Swedish men during these years) were compared between three groups (born 1968 — 1976): 746 adoptees born in South Korea, 1548 adoptees born in other non-Western countries and 330 986 non-adopted comparisons in the same birth cohort. (cambridge.org)