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NAQC Newsroom: Research

Reducing Smoking Reduces Suicidality Among Individuals with Psychosis: Complementary Outcomes From a

Monday, August 15, 2016  
Posted by: Natalia Gromov
Anoop Sankaranarayanan, Vanessa Clark, Amanda Baker, Kerrin Palazzi, Terry J. Lewin, Robyn Richmond, Frances J. Kay-Lambkin, Sacha Filia, David Castle, Jill M. Williams.
Reducing Smoking Reduces Suicidality Among Individuals with Psychosis: Complementary Outcomes From a Healthy Lifestyles Intervention Study.
Psychiatry Research 243 (2016) 407ā€“412
This study sought to explore the impact of smoking reduction on suicidality (suicide ideation and behaviour) among people with a psychotic disorder (nĀ¼235) who participated in a randomized trial of a healthy lifestyle intervention trial. Suicidality, measured by item 4 of the Brief Psychiatric Rating Scale (BPRS) was the main variable of interest. Measures were collected by research assistants blind to treatment allocation at baseline, at 15 weeks (mid-intervention) and 12 months after baseline. Mediation analysis, adjusted for confounders, was used to determine the relationship between smoking reduction and suicidality and to explore whether this was mediated through depression. At 12 months, smoking reduction was found to be significantly associated with suicidality change; an association was also seen between smoking reduction and depression and depression and suicidality. After adjusting for depression, the association between smoking reduction and suicidality was attenuated but remained statistically significant; the proportion of the total effect that was mediated through depression was 30%. There was no significant association between suicidality and treatment group (vs. controls) over time. Our study suggests that smoking interventions may have benefits over and above those for improved physical health, by reducing suicidal ideation in people with psychosis.

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