Background Excessive smartphone use has been associated with numerous psychiatric disorders. This study aimed to investigate the prevalence of smartphone addiction and its association with depression, anxiety, and attention-deficit hyperactivity disorder (ADHD) symptoms in a large sample of Korean adolescents. Methods A total of 4512 (2034 males and 2478 females) middle- and high-school students in South Korea were included in this study. Subjects were asked to complete a self-reported questionnaire, including measures of the Korean Smartphone Addiction Scale (SAS), Beck Depression Inventory (BDI), Beck Anxiety Inventory (BAI), and Conners-Wells’ Adolescent Self-Report Scale (CASS). Smartphone addiction and non-addiction groups were defined using SAS score of 42 as a cut-off. The data were analyzed using multivariate logistic regression analyses. Results 338 subjects (7.5%) were categorized to the addiction group. Total SAS score was positively correlated with total CASS score, BDI score, BAI score, female sex, smoking, and alcohol use. Using multivariate logistic regression analyses, the odds ratio of ADHD group compared to the non-ADHD group for smartphone addiction was 6.43, the highest among all variables (95% CI 4.60–9.00). Conclusions Our findings indicate that ADHD may be a significant risk factor for developing smartphone addiction. The neurobiological substrates subserving smartphone addiction may provide insights on to both shared and discrete mechanisms with other brain-based disorders.

Abstract. Background: In the Diagnostic and Statistical Manual of Mental Disorders, 5th Edition, the distinction between nonsuicidal self-injury (NSSI) and suicide attempts (SA) is highlighted in the section of conditions for further study. Aims: The objective of this study was to examine the correlates of people who presented to emergency departments (ED) with NSSI compared with those who presented with SA and no self-harm or suicidal ideation (no SH or SI). Method: Data came from 4,772 presentations to ED of tertiary care hospitals in Manitoba, Canada, between January 2009 and June 2012. Chart reviews were conducted for presentations with NSSI ( n = 158), and a sample of SA ( n = 172) and no SH or SI ( n = 173). Results: NSSI was associated with borderline personality traits/disorders, previous history of SH, and aggression/impulsivity compared with no SH or SI. SA was associated with a lower likelihood of adjustment disorder ( OR = 0.58; 95 % CI [0.34, 0.99]) and previous history of NSSI ( OR = 0.30; 95 % CI [0.17, 0.53]) compared with NSSI. Limitations: A limitation of this study is its cross-sectional design. Conclusion: Given the distress associated with NSSI, the findings highlight the need for treatment plans that address all those who present to ED with SH regardless of intent.

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