Are quantity and content of psychiatric interventions associated with suicide? A case-control study of a Swedish sample

Table 3 Results from a binominal logistic regression (full model) with a stepwise forward selection method (likelihood ratio). Suicide cases, n = 154; Controls, n = 154

Full model*	B (SE)	Wald	Sig.	OR (CI)	95% CI for OR
Full model*					Lower	Upper
Number of outpatient visits	−0.012 (0.004)	7.908	.005	0.988	0.980	0.996
Serious suicide attempt (yes)¹	1.043 (0.364)	8.233	.004	2.839	1.392	5.790
Other structured psychotherapy	−0.970 (0.509)	3.641	.056	0.379	0.140	1.027

Note: The dependent outcome variable ‘Suicide’ was dichotomized (Yes = 1, No = 0)
Abbreviations: B: beta coefficient, SE: standard error, OR: odds ratio / expected beta coefficient, CI: confidence interval for OR. For each step, the entry testing was based on the significance of the score statistic, and removal testing was based on the probability of a likelihood-ratio statistic. Degrees of freedom (df): 1 in all steps, except for ‘Intervention form’ (df = 3)
¹ Somatic specialist medical inpatient treatment due to serious suicide attempt; for diagnostic ICD-10 codes, see Appendix
^*Full model: The six independent predictor variables/covariates entered in the stepwise forward analysis were: ‘Number of visits’ (continuous variable), ‘Intervention form’ (categorical variable: Combination therapy, Psychotherapy, Psychotropics (reference), Other), ‘CBT’ (incl. DBT), and ‘Other structured psychotherapy’, ‘Serious suicide attempt’, and ‘Somatic comorbidity’ (dummy coded [Yes = 1, No = 0] variables
Full model fit: R² = 0.099 (Nagelkerke). Model χ2 = 23.818; p = .001

ISSN: 1471-244X