Mental-Physical Relationships during the preschool period

The present report is based upon mental and anthropom?trie measurements for 127 boys and 125 girls who received seriatim ex aminations between the ages of twenty-one months and seven years. The children con stitute a representative subsample of all born in Berkeley, California in the period January 1928 to June 1929. The mental tests were given by trained examiners (principally Miss Lucile Allen and Mr. G. V. Sheviakov), and the physical measurements by pediatrists (principally Dr. H. R. Stolz and Dr. Charles C. Stevenson), at the Institute of Child Wel fare of the University of California. The testing schedule involved the administration of the California Preschool Mental Scale (4) at 21 months, 3 years, 3^ years, 4 years, and 5 years; the Stanford-Binet intelligence test was given at 6 and at 7 years.2 The follow ing tabulation indicates the range of ages of the children tested at each age-level; the total Per cent of Cases Tested Within One Age Level, Age Range, NumMonth of Months Months ber Birthdate 21 20.0 to 22 219 95 24 22.5 to 25 113 72 30 25.5 to 33 114 77 36 33.5 to 39 224 76 48 45.5 to 51 208 R^ 60 57.5 to 66 209 81 72 66.5 to 78 214 86 84 78.5 to 90 207 88