Category: Suicide and Self-Injury
Keywords: Suicide | Ecological Momentary Assessment | Statistics
Presentation Type: Symposium
Intensive real-time monitoring has become increasingly popular, especially for studying suicidal ideation. One challenge of this methodology is that repeatedly sampling more than a dozen items multiple times per day can become burdensome for participants who may drop out of the study, especially during stressful times (which are the times of most interest in this research). Accordingly, the first goal of this study was to use exploratory data mining to identify which variables were the most important to include in repeated assessments of suicidal ideation and its associated risk factors. Beyond knowing which variables are important, it may also be useful to know what scores on these variables can identify those at highest risk for suicidal ideation. Accordingly, our second goal was to use exploratory data mining to identify optimal cutoffs for predicting suicidal ideation.
Inpatients (N=53) hospitalized for suicide risk completed real-time assessments of suicidal ideation and 19 different affect labels (e.g., ashamed, hopeless, abandoned) four times per day for the duration of their inpatient stay (652 total responses). We used random forests and regression trees to address our first goal. Both methods converged upon 8 of the 19 variables (self-hatred, hopeless, afraid, desperate, abandoned, hostile, inspired, and determined) as most important in predicting suicidal ideation. We used regression trees to address our second goal. We found that the highest 21% of suicidal ideation scores where characterized by “self-hatred” ratings above 7.5 (out of 10). The highest 2% of suicidal ideation scores were characterized by “self-hatred” ratings above 7.5, “desperation” ratings above 8.5, and (somewhat counterintuitively) “determined” ratings above 7.
The results of this study serve to help reduce the number of items asked during real-time monitoring studies of suicidal ideation. They also provide combinations of variables that identify the highest risk responses, highlighting the critical role of self-hatred in defining high-risk responses and the potentially ambiguous nature of ratings of “determined “in predicting the highest risk responses.
Friday, November 17
12:00 PM – 1:30 PM
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