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Average efficiency in the work of 8 Ss, as measured with the mean percentage of baseline performance, fell about 25% during the period of their illness (P. tularensis). Recovery 3 days after treatment had begun was incomplete, with performance averaging 10 to 15% below that of controls (2 double-blind hospital control Ss and a separate control group of 10 Ss).

Although the results of research on the effectiveness of the K-correction factor have been inconclusive, this procedure has been widely used with adult respondents to correct for defensiveness or underreporting of symptomatology on the Minnesota Multiphasic Personality Inventory. Although the K-correction procedure was incorporated into the Minnesota Multiphasic Personality Inventory-2, the Minnesota Multiphasic Personality Inventory-Adolescent (MMPI-A) was developed based exclusively on the use of non-K-corrected T scores. This study derived age-appropriate K-weights for the MMPI-A to determine the degree to which the use of this procedure could improve test accuracy in the classification of participants into normal and clinical groups. Discriminant function analyses were performed to determine the K-weight that, when combined with basic scale raw score values, optimally predicted normal versus clinical status for each of the eight basic clinical scales. Hit rate analyses were utilised to assess the degree to which K-corrected T scores resulted in improvements in classification accuracy in contrast to standard MMPI-A non K-corrected norms. Results indicate that the adoption of K-correction procedure for the MMPI-A does not result in systematic improvements in test accuracy and the current findings do not support the clinical use of a K-correction factor in interpreting MMPI-A protocols.

The mean percentage of baseline performance, a measure of average work efficiency, fell approximately 33% during the period of illness ( P. tularensis) of 8 experimental Ss. Four days after treatment, individual performance equaled that of controls (3 double-blind hospital control Ss and a separate control group of 10 Ss), but group-task performances appeared not to have recovered so completely. The findings extend and essentially support those of a previous study (Alluisi, et al., 1971) in which the illness-related decrement in individual performance averaged 25%, with only incomplete recovery 3 days after treatment.

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