Biomedical Education Poster Session
Adolescent substance use is a multifaceted behaviour and many psychological constructs have been strongly implicated in adolescent substance use. For instance, several studies (e.g., Butler, 1982; Kinnier, Metha, Okey & Keim, 1994) have shown negative relationships among measures of self-concept and substance use, that is, as self-concept decreases, substance use increases. In addition, other studies have demonstrated that levels of sensation-seeking are positively related to adolescent substance use (e.g., Bates, Lobouvie, & White, 1986; Newcomb & McGee, 1991). These earlier studies suggest that sensation-seeking and self-concept are important variables in understanding adolescent substance use.
However, these studies primarily examine direct or main effect relationships among predictor and outcome variables. In examining only the simple direct relationships, researchers fail to explore potential interactions among the predictor variables which means their results may be misleading. Zuckerman, Ball, and Black (1990) suggest that examination of relationships between sensation-seeking and substance use should consider the possible interaction of moderating variables. However, a review of the literature indicates that the interaction of moderating variables in predicting adolescent substance use is rarely addressed. One might theorise that feelings of high self-efficacy, might differentially affect (i.e., buffer) the sensation-seeking-substance use relationship. Under conditions of low self-efficacy it is hypothesised that the sensation-seeking substance use relationship would be maintained. Those with low feelings of self-efficacy may be more likely to respond to sensation-seeking motivations for novel activities (e.g., substance use) in a desire to either positively influence or cope with their low feelings of self-efficacy. However, under conditions of high self-efficacy, it is hypothesised that the sensation-seeking substance use relationship will be buffered. Those with higher feelings of self-efficacy, would be less influenced by sensation-seeking motivations because they possess the necessary self-efficacy to withstand the pressures associated with adolescence. The primary purpose of this study was to examine the research question “Does general self-efficacy moderate the predictive relationship of sensation-seeking on adolescent substance use and abuse?” Three forms of substance use (alcohol, tobacco, and marijuana use) and two forms of substance abuse (binge drinking and number of times drunk)were examined. All outcomes were measured over the last month.
Materials and Methods
This study uses a sub-sample from the Youth Leisure Study (YLS; Yardley et al., 1996). The sample for this study contained 420 students randomly selected from secondary schools in the Niagara Region of Ontario, Canada. The sample was stratified by grade and contained 44% males and 56% females.
Sensation seeking refers to "the seeking of varied, novel, complex, and intense sensations and experiences and the willingness to take physical, social, legal, and financial risks for the sake of such experience" (p 10) and was measured using Cooper’s (1994) scale. Bandura (1997) defines self-efficacy as “people's judgments of their capabilities to organise and execute courses of action required to attain designated types of performances. It is concerned not with the skills one has but with judgments of what one can do with whatever skills one possesses” (p. 391). While Bandura’s self-efficacy scale was domain specific, in this study a general measure of self-efficacy was used (Scherer et al., 1982). Substance use was measured using the YLS substance use scale created by Yardley et al. in collaboration with professionals in the substance use field.
Factor analyses, reliablities analyses and examination of residuals tested the distributions of predictor and outcome variables. In all but one case, the outcome variables conformed to theoretical models. The residuals for the marijuana use outcome were unaffected by transformation procedures and remained problematic.
Moderated hierarchical multiple regression (MHMR) analyses were used to examine relationships among predictor, moderating, and outcome variables. In order to examine the moderating relationship, an interaction term (sensation seeking x general self efficacy) was computed. Prior to creation of the interaction terms, each variable underwent a centering transformation to reduce chances of multicollinearity (Aiken & West, 1991). In this study, the regression procedure contained 3 steps; step 1 - demographic covariates, step 2 - predictor variables, and step 3 interaction terms. Step 1 contains demographic covariates (age, gender, importance of religion) which were identified in the literature as being influential in substance use relationships. By entering the interaction terms in step 3, the unique predictive ability of these terms can be examined.
Results of the regression analyses are presented in Table 1 below. General self-efficacy was a significant, negative, predictor of all forms of substance use (alcohol B= -.086, p<.05; tobacco -.125, p<.01; and marijuana use -.154, p<.001; binge drinking -.109, p<.05; and number of times drunk -.113, p<.05) indicating that as general self efficacy increases, substance use decreases. In addition, sensation seeking was found to be a significant, positive predictor of all forms of substance use (alcohol B= .369, p<.001; tobacco .215, p<.001; and marijuana use .287, p<.001; binge drinking .345, p<.001; and number of times drunk .334, p<.001) indicating that as sensation seeking increases, substance use increases.
------------------------------------------------------------------------------ Alcohol Binge # of Times Tobacco Marijuana Use Drinking Drunk Use Use Predictors ------------------------------------------------------------------------------ Step 1 Covariates (total R sq.) .113*** .129*** .075*** .082*** .069*** Step 2 Substantive Predictors Sensation-seeking (beta values) .369*** .345*** .334*** .215*** .287*** General Self-efficacy (beta values) -.086* -.109* -.113* -.125** -.154*** Step 3 Interactions (Total R sq.) .002 .003 .002 .002 .012* sensat x selfeff (beta values) -.044 -.052 -.040 -.048 -.112* TOTAL R sq. .233*** .259*** .198*** .145*** .191*** ------------------------------------------------------------------------------ * = p<.05, ** = p<.01, *** = p<.001
However, in step 3 of the regression analyses, the interaction term was significant for the sensation seeking marijuana use relationship only. Under conditions of high sensation-seeking, marijuana use for adolescents with low general self-efficacy was higher than for adolescents with high general self-efficacy. This relationship is presented in Figure 1.
Discussion and Conclusion
The results indicate that sensation-seeking is positively and significantly related to each of the substance use measures in this study. This finding extends previous research (e.g., Bates, Lobouvie, & White, 1986; Zuckerman, Ball, & Black, 1990) by including substance abuse (i.e., binge drinking and number of times drunk) which were also found to have a positive relationship with sensation seeking. This significant relationship among sensation-seeking and forms of substance use is consistent across each of the substance use outcomes (alcohol, tobacco, and marijuana use, binge drinking and number of times drunk). This positive relationship with sensation-seeking may indicate that adolescents use and abuse substances simply for the sensation they provide.
The findings for general self-efficacy with the substance use variables indicate that substance use decreases as general self-efficacy increases. This finding supports previous research that found relationships among self-concept variables and forms of substance use. In this study, the consistent pattern across all substance use variables (alcohol use, tobacco use, marijuana use, number of times drunk, and binge drinking) shows that general self-efficacy is an important variable in understanding adolescent substance use and abuse. Higher levels of general self-efficacy are associated with lower levels of substance use in adolescents. This may be due to adolescents using substance use as a means of coping with a low self-evaluation, such as low self-efficacy (Bandura, 1977; Cooper, 1994). General self-efficacy predicts the use of these substances but in this study it does not moderate the influence of sensation-seeking- alcohol use and abuse relationships, or the sensation-seeking-tobacco use relationship. Therefore, it appears that, with the exception of marijuana use, the prediction of substance use by sensation-seeking is not moderated by general self-efficacy. High sensation seekers with high levels of general self-efficacy were less likely to be marijuana users than high sensation seekers with low levels of general self-efficacy. The nature of marijuana use may be important in understanding this relationship. The other substance use variables in this study (alcohol use, tobacco use, number of times drunk, and binge drinking) may not hold the same sensational quality that marijuana use does. In marijuana use, the risk of legal repercussions are more serious and, therefore, one might argue that the activity is more sensational. While for many adolescents, the use of alcohol and tobacco is still illegal, they result in a less severe criminal penalty than the penalty for marijuana use. This supports the hypothesis that for adolescents, high levels of general self-efficacy may provide a buffer or insulate against sensation-seeking drives toward deviance.
Future research may examine other dimensions of self-concept to determine their role in the sensation-seeking-substance use relationship. In this study general self-efficacy, a more general measure of self-efficacy was used. It is possible that different dimensions of the self-concept may influence sensation-seeking-substance use relationships in different ways. Therefore, the moderating effects of other measures of self-concept (e.g., self esteem, self confidence, physical self-concept) should be examined to determine their influence on sensation-seeking-substance use relationships.
A greater understanding of the mechanisms which influence and contribute to substance use and abuse may lead to the development of programs designed to address the complex needs of adolescents. Increased research may lead to decreased adolescent substance use creating beneficial repercussions in many areas, including crime prevention, school performance, as well as psychological and physical health. However, a strong foundation of knowledge regarding the multi-faceted behaviour of adolescent substance use is required before these positive outcomes can occur.
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|Baker, J.R.; Yardley, J.K.; Montelpare, W.J.; (1998). Moderating Effect of General Self-Efficacy on the Relationship Between Sensation-Seeking and Adolescent Substance Use. Presented at INABIS '98 - 5th Internet World Congress on Biomedical Sciences at McMaster University, Canada, Dec 7-16th. Available at URL http://www.mcmaster.ca/inabis98/biomededu/baker0125/index.html|
|© 1998 Author(s) Hold Copyright|