A new study in the Journal of Affective Disorders documents again that many college students think about suicide and also identifies key risk factors that may assist with prevention efforts. The findings are based on a study of more than 1,000 students at the University of Maryland at College Park who were tracked over four years. Of the 1,085 students, 151 (12 percent) said they had pondered committing suicide at least once -- with 37 saying they did so repeatedly, 10 saying that they had made plans or carried out full-fledged attempts during college. Lack of social support was identified as a key factor in predicting persistent suicidal thoughts. Other risk factors: depressive symptoms, exposure to domestic violence in childhood and having a mother suffering from depression.