Every 40 seconds someone is dying by suicide somewhere in the world and there are countless unknown suicide attempts (1). Suicide is a major public health problem worldwide (2) (Lindstrom & Rosvall, 2018) with around 703,000 deaths every year (3). Suicide deaths have, arguably, more deleterious impacts on society than any other deaths. In fact, for every suicide death, it is believed that around 135 persons directly or indirectly get affected and may need health care services (4).
Previous studies showed that suicidal ideation precedes suicide plan, attempt, and behavior (5, 6). In fact, among all predictors of suicide, suicidal ideation is thought of as the biggest predictor of a subsequent suicidal event (7). Klonsky and colleagues claimed that intervention should focus on prevention of ideation, rather than on much more serious suicidal behaviors (8).
Adolescence is a period in which, among the various stages of life, one may be most exposed to suicide. A survey by Avenevoli and colleagues reported that 16% of students between the grades of 9 and 12 had seriously thought of committing suicide, and eight percent had attempted suicide in the previous 12 months (9). Studies focusing on adolescence and young adulthood have shown that suicide was related to oppositional defiant disorder, other conduct and psychological disorders, aggression, substance use, and internet gaming disorder or internet addiction (10–12).
It was argued that self-control was a protective factor of suicidal ideation (13), but to date no study has investigated the mediation role of self-control in the relationships between oppositional defiant disorder, internet gaming disorders, and suicidal ideation. Further, gender differences have been reported in the incidence of suicidal ideation (14), but no prior study has examined an interaction with gender among Saudi adolescents. Therefore, the purpose of this study was to investigate the relationships among oppositional defiant disorder, internet gaming disorder, and suicidal ideation, and to test a moderated mediation model of gender and self-control among Saudi adolescents.
Oppositional Defiant Disorder and Suicidal Ideation
Oppositional defiant disorder (ODD) is, typically, a childhood disorder whose characteristics include persistent defiant and antagonistic behavior, irritability, anger, and argumentativeness (15, 16). A meta-analysis that examined ODD among samples around the world reported that around 3.3% of children and adolescents had symptoms of this disorder (17). Boylan et al. (2007) studied clinic samples and reported much higher estimates, a prevalence of ODD in between 28% and 65% of children (18). When ODD is not treated in early childhood, it may be a predictor of behavioral and psychological issues during adolescence (19, 20).
Oppositional defiant disorder has been associated with social impairment, problematic interaction with others, even online, and conflict with authority figures, that is, overall, individuals with ODD encounter various challenges in their lives (21) which may lead to suicidal ideation. Others have reported that the irritability nature of ODD was related to suicidal ideation among detained teen offenders (22). Among children with ADHD, research showed that ODD was related to suicidal ideation (23).
Thus, our first hypothesis for our study is as follows:
H1: Oppositional defiant disorder is positively related to suicidal ideation
Internet Gaming Disorder and Suicidal Ideation
Internet gaming disorder (IGD) has been claimed as a public health problem worldwide. Previous studies have found that, more generally, internet addiction was related to suicidal ideation (24–26). Other studies demonstrated that people with increased IGD have high odds of thinking about suicide than their counterparts (27). Junus and colleagues found that adolescents with IGD had higher lifetime suicide attempts as compared to their counterparts (28). Cheng and colleagues carried out a meta-analysis of 15 studies and concluded that those who were addicted to internet gaming had higher odds of suicide ideation (27). A systematic literature review by Erevik and colleagues, involving 12 studies, also found a positive relationship between problem gaming and suicidal ideation and/or attempts (29).
Thus, our second hypothesis:
H2: Internet gaming disorder is positively related to suicidal ideation
The Mediation Role of Self-Control
Self-control can be defined as “the ability to change or override one’s inner responses, as well as to interrupt undesired behavioral tendencies (such as impulses) and refrain from acting on them” (30, p. 274). Prior studies reported that people with increased self-control exhibited lower levels of depression (31). Conversely, adolescents with low self-control reported increased depression (32). High self-control has been related to additional positive outcomes, including better mental and physical health, healthy relationships, and academic success (30, 33). Others revealed that high self-control was related to reduced levels of IGD (34). Previous studies have indicated that self-control can be protective with regard to suicidality; Martin and colleagues, for example, found that self-control was negatively related to suicidal ideation (13).
H3: Self-control mediates the association between oppositional defiant disorder and suicidal ideation
H4: Self-control mediates the association between internet gaming disorder and suicidal ideation
The Moderation Role of Gender
It has been shown empirically that the occurrence of suicidal ideation is different for females and males. Blum and colleagues and Peltzer and Pengpid found that females were more likely to have higher rates of suicide ideation(35, 36). Previous research also showed gender differences with regard to self-control: females had higher self-control than males, as well as less delinquent behavior (37, 38). On the other hand, males adolescents have higher oppositional defiant behaviors and excessive gaming behaviors (39–41). Given these gender differences, one might expect the relationships between ODD, IGD, and suicidal ideation to be different in females and in males.
H5: Gender moderates the mediation of self-control between oppositional defiant disorder and suicidal ideation
H6: Gender moderates the mediation of self-control between internet gaming disorder and suicidal ideation