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Background and Objective: Gender differences in biobehavioral responses to environmental stressors and experience of psychological stress should be identified. This study was done to evaluate the changes of the level of salivary cortisol under psychological stress and its relationship with rumination and personality traits.

Methods: In this case-control study, for 45 medical students, The NEO Personality Inventory-Short Form and emotional control questionnaire (ECQ) were filed two months before the final examination. Saliva samples were taken from students in the non-stress (control) and examination stress conditions. Salivary cortisol levels were measured by ELISA method.

Results: Gender differences were not observed in the level of salivary cortisol under psychological stress. Significant difference was observed between the mean of salivary cortisol in the non-stress and under examination stress conditions. Positive correlation was found between traits of neuroticism (P<0.05) and rumination (P<0.05) with salivary cortisol as well as negative correlation between the traits openness to experience (P<0.05) and angery control (P<0.05) with salivary cortisol. Neuroticism, rumination and angery control may predict a substantial variance (32%) of salivary cortisol under exam stress.

Conclusion: Psychological stress leads to increase in the secretion of salivary cortisol unrelated to gender. Subjects with different personality traits are prone to cortisol responses to stress based on their particular character.

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Background and Objective: Postpartum depression has a negative effect on maternal health and adverse effect on psychological development of newborns. Also patterns and personality traits can also be associated with postpartum depression. This study aimed to determine the role of social support and Personality in the incidence of postpartum depression.
Methods: This descriptive-analytical study was performed on 200 mothers referred to health centers by available sampling method between 6 weeks to 6 months after delivery. Data were collected using a Questionnaire Personal Information, Edinburgh Postnatal Depression Scale (EPDS, 1987), NEO-Five Factor Inventory (NEO-FFI, 1985) and Social Support Questionnaire Philips (1977).
Results: Postpartum depression was observed in 49 (24.5%) of mothers. Neuroticism had the highest relationship with postpartum depression. The correlation coefficient of this variable with postpartum depression was 52% and this variable alone was 27% of the variance. There was a significant negative relationship between postpartum depression and social support (r= -0.027, P<0.01). There was a significant positive correlation between postpartum depression and neuroticism (r= 0.52, P<0.01).
Conclusion: This study showed that personality traits and social support are two important factors in relation to postpartum depression.