OBJECTIVE: The aims of this study were to investigate the personality traits of suicide completers using the Temperament and Character Inventory (TCI) scale. METHODS: Newly enrolled students who enrolled at Hokkaido University in 1999-2002 and 2004-2007 completed the TCI. Among these students, twenty subjects (2 females and 18 males) later completed suicide. We compared the TCI scales of these subjects with those of 60 (6 females and 54 males) well-matched controls. The controls were matched for age, gender, university department and year of enrollment in the university. Because the number of females was too small, the statistical analyses for the TCI subscales and logistic regression analysis were performed only with the 18 males. RESULTS: A univariate analysis of seven personality dimensions on the TCI revealed higher scores of harm avoidance (HA) in subjects with suicide completion (P=0.034). Analysis of the male subjects showed that suicide completers had higher scores for anticipatory worry (HA1, P=0.007) and fear of uncertainty (HA2, P=0.036) and lower scores for spiritual acceptance (ST3, P=0.038) than did the controls. A multivariate analysis, which was performed to adjust confounding factors, demonstrated significantly higher scores for HA1 among suicide completers (P=0.01, OR=1.32). CONCLUSIONS: These results suggest that higher HA scores may predict suicide completion.
OBJECTIVE: The aims of this study were to investigate the personality traits of suicide completers using the Temperament and Character Inventory (TCI) scale. METHODS: Newly enrolled students who enrolled at Hokkaido University in 1999-2002 and 2004-2007 completed the TCI. Among these students, twenty subjects (2 females and 18 males) later completed suicide. We compared the TCI scales of these subjects with those of 60 (6 females and 54 males) well-matched controls. The controls were matched for age, gender, university department and year of enrollment in the university. Because the number of females was too small, the statistical analyses for the TCI subscales and logistic regression analysis were performed only with the 18 males. RESULTS: A univariate analysis of seven personality dimensions on the TCI revealed higher scores of harm avoidance (HA) in subjects with suicide completion (P=0.034). Analysis of the male subjects showed that suicide completers had higher scores for anticipatory worry (HA1, P=0.007) and fear of uncertainty (HA2, P=0.036) and lower scores for spiritual acceptance (ST3, P=0.038) than did the controls. A multivariate analysis, which was performed to adjust confounding factors, demonstrated significantly higher scores for HA1 among suicide completers (P=0.01, OR=1.32). CONCLUSIONS: These results suggest that higher HA scores may predict suicide completion.