A comparison of the Revised Stanford l and the Bellevue Adult Intelligence Test as clinical instruments

Conclusions

• 1. The Bellevue Adult Intelligence Test has a definite advantage over the Revised Stanford L from the point of view of time consumed in administration.

• 2. For subjects between the ages 15 and 34, the two scales give similar results; but the Bellevue Adult seems preferable from the point of view of time consumed, richness of results and suitability of tasks.

• 3. For subjects between the years 10 and 13, the Bellevue scores are a little too low. The Bellevue verbal tests are not suitable for this age level. The Stanford is more desirable from the point of view of the results obtained and the inclusion in those results of the patient’s mental age.

• 4. Subjects over 34 years of age generally make more valid scores on the Bellevue than on the Stanford, though the allowance which the Bellevue makes for the falling off of ability with advancing age seems too generous.

• 5. Groups compared for intelligence level rather than age show the greatest discrepancy in test results at the superior level, and the least at the defective level. The Bellevue scores become higher than the Stanford scores as the mental level falls, probably because subjects of inferior intelligence do relatively well on nonverbal tests.