Rocklin and Revelle  also examined and approved the content validity of the questionnaire correlating it with Eysenck personality inventory
, a questionnaire measuring personality traits of neuroticism, psychoticism and extroversion.
Mood assessments included the MADRS self-rating scale for depression, the Buss-Perry Aggression scale, the L and N scales of the Eysenck Personality Inventory
, the 30-item General Health Questionnaire, the visual analog scales (VAS) for irritability/distress, the VAS for blue/depressed, and the VAS for social function.
A psychological evaluation was performed by a psychologist, who used the Eysenck Personality Inventory
, the State-Trait Anxiety Inventory, the Zung Self-Rating Depression Scale, and the Illness Behavior Questionnaire (IBQ).
The stress and personality measures were assessed in 1972-1973 using the Eysenck Personality Inventory
, and the fatigue symptoms were assessed in 1998-2002, when the patients were aged 42-64 years (Arch.
Another study required subjects to copy a paragraph on unlined paper, and also to take the Eysenck Personality Inventory
as assessment of their level of extroversion.