Table 5. Final reduced models assessing effects of personality factors on cortisol concentrations after ACTH stimulation.
| Model | Variable | Parameter estimate | Confidence Interval 95% | p-value | |||
|---|---|---|---|---|---|---|---|
| 2.5% | 97.5% | ||||||
| Cortisol 60 minutes after ACTH stimulation (square-root transformation) versus Part 2 (personality factors) | Intercept | 2.297 | 2.206 | 2.389 | Adjusted R2 | 2% | |
| Social interaction | F1,147 | 4.181 | |||||
| Social interaction | -0.079 | -0.155 | -0.003 | 0.043 | p | 0.043 | |
| Cortisol 90 minutes after ACTH stimulation versus Part 2 (personality factors) | Intercept | 7.390 | 6.947 | 7.833 | Adjusted R2 | 4% | |
| Social interaction | F1,146 | 6.350 | |||||
| Social interaction | -0.471 | -0.841 | -0.102 | 0.013 | p | 0.013 | |
Results of the final reduced linear models with the lowest Akaike’s Information Criterion (AIC) evaluating the association between cortisol concentrations 60 and 90 minutes after adrenocorticotropic hormone (ACTH) administration and the factors anxiety, trainability, recovery, social interaction, alertness, affability and transportability gained by Principal component analysis of the second part of the questionnaire about personality traits.