Is a successful high-K fitness strategy associated with better mental health?

From the book : Evolutionary Psychology 7 issue 1 : 28-39.
This study examined the associations between a high-K fitness strategy and mental health.
These associations were tested on a sample of 1400 disaster workers who had exposure to a singular traumatic event and who underwent psychological evaluations.
The results showed that high-K was an important negative predictor of psychopathology, accounting for significant variance in PTSD, general psychopathology, functional disability, anger, and sleep disturbances.
Implications of the results are discussed.