Purpose: We aim to explore the distinctive interrelationships between family income and mental disorders on suicidality in recent 12 months.
Methods: A stratified random subsample of adults in a household survey in US, National Comorbidity Survey Replication, was used for analyses. The ratio of family income to poverty threshold (RoFIPT) per capita was the primary predictor of interest to 12-month occurrence of suicide ideation and attempt. Effect modification by mental disorders was further explored.
Results: A total of 4,724 subjects were analyzed. Inverse associations were found with RoFIPT for both suicidal outcomes after confounding control. Furthermore, effect modification was revealed that RoFIPT was more strongly associated with suicide ideation for those with mental disorders (OR 0.87; 95 % CI 0.79, 0.95).
Conclusions: An inverse gradient of RoFIPT was shown with suicide ideation and attempt. Moreover, having mental disorders was found to be an effect modifier for the relationships between family income and suicidality.