(Ipts) in the South African Context
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UNIVERSITY OF KWAZULU-NATAL TESTING THE INTERPERSONAL-PSYCHOLOGICAL THEORY OF SUICIDAL BEHAVIOUR (IPTS) IN THE SOUTH AFRICAN CONTEXT BY SAROJINI NAIDOO A dissertation submitted in fulfilment of the requirements for the degree of Doctor of Philosophy (Psychology) Discipline of Psychology School of Applied Human Sciences College of Humanities December 2016 Supervisor: Professor Steven J. Collings DECLARATION I, Sarojini Naidoo, declare that: (i) The research reported in this dissertation, except where otherwise indicated, is my original work. (ii) This dissertation has not been submitted for any degree or examination at any another university. (iii) This dissertation does not contain other persons’ data, pictures, graphs or other information, unless specifically acknowledged as being sourced from said persons. (iv) This dissertation does not contain other persons’ writing, unless specifically acknowledged as being sourced from other researchers. Where other written resources have been quoted, then: a. their words have been rewritten but the general information attributed to them has been referenced b. where their exact words have been used, their writing has been placed inside quotation marks, and referenced. (v) This dissertation does not contain text, graphics or tables copied and pasted from the Internet, unless specifically acknowledged, and the source being detailed in the dissertation and in the references section. Signed: …………………………………………… Date : ……………………………………………. ii ACKNOWLEDGEMENTS I would like to express my gratitude to the following persons/organisation: 1. My supervisor, Professor Steven Collings, whose passion for research and amazing statistical brain kept me motivated and inspired throughout this process. I owe you a debt of gratitude. 2. My family, especially my sister and brother in law, Vasie and Leon Pillay, for their constant support and encouragement. Thank you for always being there for me. 3. My friends, Cynthia Patel and Zubi Paruk, who ignited my interest in academic writing and readily assisted me in numerous ways through this process. Thank you for your friendship and support through the years. 4. My friend Sachet Valjee, who walked on this journey with me and shared the highs and lows that completing a dissertation entails. This journey has sealed our friendship. 5. My amazing Kris, Kerushan and Sachin whose boundless love, patience and belief in me have sustained me through this period. I could not have done this without your presence in my life. 6. The National Research Foundation for their awarding of a Doctoral Sabbatical grant to me that enabled me to complete this dissertation. 7. The gatekeepers of all the sites included in this research for facilitating my access to the participants of this study. 8. Finally, the participants of the study, whose contributions to the generation of knowledge in this field are acknowledged with gratitude. iii ABSTRACT In spite of suicidality being a global mental health care problem, there has been relatively little empirical advancement in the conceptualization of suicide in recent years. Joiner’s (2005) Interpersonal-Psychological theory of suicidal behaviour (IPTS) attempts to answer the question of why people die by suicide. Joiner contends that people die by suicide because they can and because they want to. He proposes that the confluence of the interpersonal states of perceived burdensomeness and thwarted belongingness is the condition under which death ideation transforms into suicidal ideation, and in the presence of a third construct, an acquired capability for suicide, leads to a lethal suicide attempt. The theory has been lauded as an empirical advancement in our understanding of suicidality, as it provides testable hypotheses that translate into practical interventions. However, tests of the theory have provided inconsistent support for its hypotheses. Using a sample of 239 psychiatric outpatients from nine sites, the main hypotheses of Joiner’s theory were tested in the present study. Study findings provide unqualified support for all key IPTS hypotheses: Perceived burdensomeness and thwarted belongingness independently predicted death ideation; the confluence of these interpersonal states, in the presence of hopelessness regarding these states, predicted suicidal ideation and finally, the joint presence of acquired capability for suicide and suicidal ideation was associated with moderate to high risk for a suicide attempt. In addition, two new measures were developed for the present study: (a) the Death Inurement Scale and (b) the Interpersonal Hopelessness Scale, to address the limitations of available measures. Demographic and mental health predictors of IPTS constructs were also explored using regression analyses. The study findings suggest that the IPTS is a valid theory for understanding suicidal behaviour in the South African context. The findings are discussed with respect to their implications for theory, practice, and future research. iv TABLE OF CONTENTS Page No. DECLARATION………………………………………………………………………….............ii ACKNOWLEDGEMENTS………………………………………………………........................iii ABSTRACT……………………………………………………………………………………...iv LIST OF TABLES…………………………………………………………………. …………..xiv LIST OF FIGURES…………………………………………………………………….…...…..xvi LIST OF ABBREVIATIONS………………………………………………………………….xvii CHAPTER ONE: INTRODUCTION ………………………………………………………….….1 1.1 Background to the research problem………………………………………………………….1 1.2 The Interpersonal-Psychological Theory of suicidal behaviour (IPTS)……………………..3 1.3 Objectives of the present study……………………………………………….……………...5 1.4 Contributions of the present study to the existing body of knowledge………………………5 1.5 Organization of the dissertation……………………………………………………………...6 CHAPTER TWO: REVIEW OF THE LITERATURE…………………………………………...8 2.1 Introduction………………………………………………………………………………......8 2.2 The nature of the problem………………………………………………………………........8 2.2.1 Changing social perspectives on suicide……………………………………………….......8 2.2.2 Nomenclature…………………………………………………………………………......10 2.2.3 Nosology……………………………………………………………………………….....15 2.2.3.1 Suicidal behaviour……………………………………………………………………....15 2.2.3.2 Distinguishing suicidal and nonsuicidal self-injury….………………………………….18 v 2.3 The epidemiology of suicide……………………………………………………………….,21 2.3.1 The extent of the problem………………………………………………………………….21 2.3.1.1 International perspectives…………………………………………………………….....21 2.3.1.2 South African perspectives……………………………………………………………...23 2.4 Risk and protective factors for suicide……………………………………………………….26 2.4.1 Demographic characteristics………………………………………………………………27 2.4.1.1 Age………………………………………………………………………………………27 2.4.1.2 Gender…………………………………………………………………………………..28 2.4.1.3 Race/ethnicity……………………………………………………………………...........30 2.4.2 Biopsychosocial risk factors………………………………………………………………32 2.4.2.1 Interpersonal conflict……………………………………………………………............32 2.4.2.2 Mental disorders…………………………………………………………………............34 2.4.2.3 Previous suicide attempts…………………………………………………….................36 2.4.2.4 Physical illness………………………………………………………………………....38 2.4.2.5 Poverty and unemployment…………………………………………………………......39 2.4.2.6 Social isolation……………………………………………………………………….....40 2.4.2.7 Religion and suicide……………………………………………………………….........42 2.4.2.8 Coping styles……………………………………………………………………….........43 2.5 Conceptualising suicidal thoughts and behaviours…………………………………………45 2.5.1 Sociological theories………………………………………………………………………45 2.5.2 Bio-physical theories…………………………………………………………………......47 2.5.3 Psychoanalytic theories……………………………………………………………………49 2.5.4 Shneidman’s psychological theory………………………………………………………..51 vi 2.5.5 Cognitive theories of suicide………………………………………………………………53 2.5.5.1 Beck’s cognitive theory………………………………………………………….............53 2.5.5.2 Baumeister’s escape theory………………………………………………………...........55 2.5.5.3 The Hopelessness theory of suicidality………………………………………..........……57 2.6 The case for a multidimensional theory of suicide………………………………………......58 2.7 The Interpersonal-Psychological theory of suicidal behaviour (IPTS)………………………59 2.8 A brief comparison of the Hopelessness and the Interpersonal-Psychological theories of suicidality………………………………………………………………………..64 2.9 Key hypotheses of the IPTS…………………………………………………………………66 2.10 Empirical tests of IPTS hypotheses………………………………………………………...66 2.10.1 Hypothesis 1: Risk factors for death ideation…………………………………………......66 2.10.2 Hypothesis 2: Proximal risk factors for suicide ideation………………………………….68 2.10.3 Hypothesis 3: Risk factors for potentially lethal suicidal behaviour………………............69 2.11 Methodological issues in research on the IPTS………………………………………….....70 2.12 Conclusions and implications………………………………………………………………73 CHAPTER THREE : RESEARCH METHODOLOGY…………………………………………75 3.1 Introduction……………………………………………………………………………….....75 3.2 Research approach…………………………………………………………………………...75 3.3 Research aims………………………………………………………………………………..76 3.4 Research objectives……………………………………………………………………….....76 3.5 Research questions…………………………………………………………………………..77 3.6 Location of the study…………………………………………………………………………78 3.7 Sites of the study…………………………………………………………………………......78 vii 3.8 Sampling strategy……………………………………………………………………………79 3.9 Research participants………………………………………………………………………..80 3.10 Research procedure………………………………………………………………………...82 3.11 Research instruments………………………………………………………………………83 3.11.1 Measures of IPTS risk factors……………………………………………………………83 3.11.2 Measures of IPTS outcome variables……………………………………………………85 3.12 Data preparation……………………………………………………………………………86