Background: Comprehending of suicidal ideation and related factors has valuable clinical outcomes in domains of prevention and crisis intervention. The aim of the present study was to explore the predictive role of psychological, demographical and socio-economic factors in suicidal ideation.

Material and Methods: In a cross-sectional descriptive study, 671 persons among general population of Semnan City were selected by voluntary sampling. Data were collected with NEO-Five Factor Personality Inventory, Symptom Check-List Revised, The Defense Style Questionnaire, The Beck Scale for suicide Ideation, The Beck Hopelessness Scale, The Social Support Questionnaire and demographical questionnaire, then analyzed by correlation and Logistic Regression with SPSS.

Results: Literacy level (OR=1.237 P<0.014), Family relationships (OR=1.873 P<0.010), Outcome (OR=4.211 P<0.003), Job status (OR=3.149 P<0.008), History of psychiatric disorders (OR=5.754 P<0.003), Hospitalization in psychiatric ward (OR=2.003 P<0.011), Neuroticism (OR=6.136 P<0.001), Extraversion (OR=3.612 P<0.005), Neurotic defense style (OR=2.468 P<0.005), Mature Defense Style (OR=4.107 P<0.002), Immature Defense Style (OR=3.059 P<0.003), Social Support (OR=7.609 P<0.001), and Hopelessness (OR=9.834 P<0.001) significantly differentiated persons with suicidal ideation from persons without suicidal ideation (P<0.001). These variables totally could correctly predict 97.4% of suicidal ideation.

Conclusion: In this model, risky psychological, demographical and socio-economic factors increase the odds ratio of suicidal ideation. These findings have importance for designing of preventive interventions and interventional programs for self-harm behaviors.