This study examined the concurrent validity of the Snijders-Oomen Nonverbal Intelligence Test–Revised compared to the Wechsler Preschool and Primary Scale of Intelligence–Revised. Subjects were 25 4-yr.-olds of lower, lower-middle, and middle socioeconomic status from both urban and rural areas of Appalachia. The SON–R IQs correlated .93 and .87 with the WPPSI–R Performance IQs and Full Scale IQs, respectively. The correlation of .45 with Verbal IQs was not significant.
