Table 3.
Tests of the Sensitization Model for Suicide Attempts
| Suicide Intent – Model with Past Attempts but not Age (ordinal logistic regression) | ||||||
|---|---|---|---|---|---|---|
| Variable | b | se | OR | 95% CI | z | p |
| Attempt Number | 0.110 | 0.042 | 1.12 | 0.028, 0.191 | 2.64 | 0.008 |
| Gender | −0.328 | 0.365 | 0.72 | −1.044, 0.388 | −0.90 | 0.370 |
| Race/Ethnicity | −0.131 | 0.343 | 0.88 | −0.802, 0.541 | −0.38 | 0.703 |
|
Suicide Intent – Model with Age but not Past Attempts (ordinal logistic regression) | ||||||
| Age | 0.066 | 0.027 | 1.07 | 0.013, 0.120 | 2.42 | 0.015 |
| Gender | −0.257 | 0.375 | 0.78 | −0.991, 0.478 | −0.68 | 0.494 |
| Race/Ethnicity | −0.101 | 0.382 | 0.91 | −0.850, 0.648 | −0.26 | 0.791 |
|
Suicide Intent – Model with Both Past Attempts and Age (ordinal logistic regression) | ||||||
| Attempt Number | 0.086 | 0.047 | 1.09 | −0.007, 0.178 | 1.82 | 0.069 |
| Age | 0.052 | 0.032 | 1.05 | −0.010, 0.114 | 1.65 | 0.100 |
| Gender | −0.265 | 0.362 | 0.77 | −0.973, 0.444 | −0.73 | 0.464 |
| Race/Ethnicity | −0.145 | 0.353 | 0.87 | −0.838, 0.547 | −0.41 | 0.681 |
|
Lethality – Model with Past Attempts but not Age (ordinal logistic regression) | ||||||
| Attempt Number | 0.092 | 0.054 | 1.09 | −0.015, 0.198 | 1.69 | 0.091 |
| Gender | 0.170 | 0.351 | 1.19 | −0.857, 0.518 | −0.48 | 0.629 |
| Race/Ethnicity | 0.001 | 0.535 | 0.99 | −1.048, 1.049 | 0.00 | 0.999 |
|
Lethality – Model with Age but not Past Attempts (ordinal logistic regression) | ||||||
| Age | 0.124 | 0.038 | 1.13 | 0.050, 0.197 | 3.30 | 0.001 |
| Gender | −0.034 | 0.349 | 0.71 | −0.718, 0.650 | −0.10 | 0.923 |
| Race/Ethnicity | −0.124 | 0.422 | 0.88 | −0.951, 0.703 | −0.29 | 0.769 |
|
Lethality – Model with both Past Attempts and Age (ordinal logistic regression) | ||||||
| Attempt Number | 0.043 | 0.050 | 1.05 | −0.055, 0.142 | 0.86 | 0.388 |
| Age | 0.117 | 0.039 | 1.12 | 0.041, 0.193 | 3.02 | 0.003 |
| Gender | 0.031 | 0.333 | 1.03 | −0.622, 0.683 | 0.09 | 0.927 |
| Race/Ethnicity | 0.155 | 0.423 | 1.17 | −0.675, 0.984 | 0.36 | 0.715 |
|
Log Time Between Successive Attempts (multiple linear regression) | ||||||
| Attempt Number | −0.326 | 0.015 | -- | −0.356, −0.297 | −21.60 | <0.001 |
| Gender | −0.134 | 0.282 | -- | 0.687, 0.419 | −0.47 | 0.653 |
| Race/Ethnicity | 0.026 | 0.424 | -- | −0.806, 0.857 | 0.06 | 0.952 |
|
Number of Life Events (negative binomial regression) | ||||||
| Attempt Number | −0.026 | 0.024 | 0.974 | −0.074, 0.022 | −1.07 | 0.286 |
| Gender | −0.159 | 0.145 | 0.853 | −0.443, 0.124 | −1.10 | 0.271 |
| Race/Ethnicity | −0.005 | 0.139 | 0.995 | −0.278, 0.268 | −0.03 | 0.972 |
|
Sum of Life Change (multiple linear regression) | ||||||
| Attempt Number | −1.856 | 4.124 | -- | −9.938, 6.227 | −0.45 | 0.653 |
| Gender | −19.725 | 27.020 | -- | −72.684, 33.233 | −0.73 | 0.465 |
| Race/Ethnicity | −8.407 | 26.109 | -- | −59.579, 42.764 | −0.32 | 0.747 |
Note: Suicide Intent = ratings from the Subjective Intent Rating Scale (Sapyta et al., 2012) for suicide attempts. Lethality = ratings of medical lethality of suicide attempts, using the Lethality of Suicide Attempt Rating Scale (Berman et al., 2003; Smith et al., 1984). Dates of suicide attempts were estimated using analogous methods to those used for dating onset and offset of symptoms on Interview Schedule for Children and Adolescents and the Follow-Up Interview Schedule for Adults (Sherrill & Kovacs, 2000). Number of life events = sum of life events listed in the tables by Miller and Rahe (1997) in the three months prior to the suicide attempt. Sum of life change = sum of life change units from life events listed in the tables by Miller and Rahe (1997) in the three months prior to the suicide attempt.