(see Table 1). The measures also included neurophysiological and neuropsychological tests to assess neurocognitive performance, particularly frontal lobe function across development during this period (detailed in Table 1 under the column heading “prospective”). If not collected previously, blood samples for genotyping were obtained. Many of the participants were one or two generations younger than the original COGA probands (e.g., nephews and grandchildren), but all were drawn from the same family lines of the probands. Youth were also recruited from the original comparison families. Altogether, 3715 individuals participated in the prospective study and were assessed an average of 4 times. In Table 6, attributes of this sample at the baseline assessment are displayed, while lifetime characteristics, as reported at any assessment wave, are shown in Table 7.
