Estimating premorbid intelligence: Comparisons of the Barona formula, North American Adult Reading Test (NAART), Wide Range Achievement Test-3 reading subtest (WRAT-3), and Oklahoma Premorbid Intelligence Estimate (OPIE)

The present investigation compared the North American Adult Reading Test (NAART), Wide Range Achievement Test-3 (WRAT-3) Reading subtest, Barona, and Oklahoma Premorbid Intelligence Estimate Best (OPIE) premorbid intelligence estimates in 64 chronic pain patients across three intelligence ranges. Results for the entire sample revealed that the NAART, Barona, and OPIE Best equations overestimated Wechsler Adult Intelligence Scale-Revised Full Scale IQ (WAIS-R FSIQ), while the WRAT-3 underestimated FSIQ. When the sample was divided into three intelligence ranges, the OPIE more accurately classified individuals with above average intelligence, while the WRAT-3 more accurately classified individuals with below average intelligence. Three methods (NAART, OPIE, and WRAT-3) provided relatively equivalent classifications of individuals in the average intelligence range. The Barona method tended to systematically under- and overestimate FSIQ across the intelligence continuum. These results suggest the potential utility of using different estimation methods for individuals in different IQ ranges, and speak to the need for development of estimation methods that incorporate current reading ability with best performance and demographic variables.

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Estimating premorbid intelligence Comparison of traditional and contemporary methods across the intelligence continuum

Griffin

Mindt

Rankin

et al. 2002

Archives of Clinical Neuropsychology

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Comparing Methods for Estimating Premorbid Intellectual Functioning

Axelrod¹,

Vanderploeg²,

Schinka³

1999

Archives of Clinical Neuropsychology

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Efforts to determine premorbid intellectual functioning for a patient prior to their current evaluation has been attempted using demographic information, current performance data, or a combination of both. Five of these premorbid intellectual prediction methods were assessed in a sample of 104 neurological patients referred for neuropsychological evaluation and a matched control sample. Predicted Full-Scale Intelligence Quotient (FSIQ) scores of patients did not differ from the true FSIQ scores of the matched controls. Logistic regression analyses found no difference in classification accuracy among the prediction methods. The findings of this study found combined demographic and performance methods developed by Vanderploeg and Schinka (1995), Vanderploeg, Schinka, and Axelrod (1996), Krull, Scott, and Sherer (1995) and Williamson, Krull, and Scott (1996) to be accurate estimates of premorbid functioning. This study found estimates of premorbid functioning based on demographic data alone (Barona, Reynolds, & Chastain, 1984) not to differ from the other methods, which is at odds with prior studies. Prospective studies employing all of these methods are recommended to clarify the utility of demographically based estimates.

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Estimating premorbid intelligence: Comparisons of the Barona formula, North American Adult Reading Test (NAART), Wide Range Achievement Test-3 reading subtest (WRAT-3), and Oklahoma Premorbid Intelligence Estimate (OPIE)

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Estimating premorbid intelligence Comparison of traditional and contemporary methods across the intelligence continuum

Estimating premorbid intelligence Comparison of traditional and contemporary methods across the intelligence continuum

Comparing Methods for Estimating Premorbid Intellectual Functioning

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