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      Factors Statistically Predicting At-Risk/Problematic Internet Use in a Sample of Young Adolescent Boys and Girls in South Korea

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          Abstract

          Aims: This study aimed to investigate in a gender-sensitive manner factors related to at-risk/problematic Internet use (ARPIU) in a sample of young Korean adolescents. Given prior findings, we hypothesized we would observe specific temperamental, social and biological measures that would statistically predict ARPIU in boys and girls, respectively.

          Method: Subjects included 653 middle-school students from Chuncheon, Korea who completed measures assessing Internet addiction, mood, temperament, and social interactions. Finger digit (2D:4D) ratios were also assessed. Chi-square and logistic regression models were conducted.

          Results: Among boys and girls, the ARPIU and non-ARPIU groups showed differences in temperament, mood, social tendencies, and gaming behaviors. In boys, IAT correlated inversely with the 2D:4D digit ratio and novelty-seeking and positively with reward-dependence scores when controlling for BDI scores; these relationships were not found in girls. Multivariate analyses showed that among boys, novelty-seeking, harm avoidance, self-transcendence, and daily time spent gaming statistically predicted ARPIU. Among girls, daily time spent gaming, number of best friends, self-directedness, and cooperation statistically predicted ARPIU.

          Conclusion: ARPIU was linked to specific temperamental, behavioral and biological characteristics, with specific relationships observed in boys and girls. Specific risk factors may exist for boys and girls with respect to their propensities to developing ARPIU, suggesting the need for gender-sensitive approaches to prevent ARPIU in youth.

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          Most cited references35

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          The ratio of 2nd to 4th digit length: a predictor of sperm numbers and concentrations of testosterone, luteinizing hormone and oestrogen

          The differentiation of the urinogenital system and the appendicular skeleton in vertebrates is under the control of Hox genes. The common control of digit and gonad differentiation raises the possibility that patterns of digit formation may relate to spermatogenesis and hormonal concentrations. This work was concerned with the ratio between the length of the 2nd and 4th digit (2D:4D) in humans. We showed that (i) 2D:4D in right and left hands has a sexually dimorphic pattern; in males mean 2D:4D = 0.98, i.e. the 4th digit tended to be longer than the 2nd and in females mean 2D:4D = 1.00, i.e. the 2nd and 4th digits tended to be of equal length. The dimorphism is present from at least age 2 years and 2D:4D is probably established in utero; (ii) high 2D:4D ratio in right hands was associated with germ cell failure in men (P = 0.04); (iii) sperm number was negatively related to 2D:4D in the right hand (P = 0.004); (iv) in men testosterone concentrations were negatively related to right hand 2D:4D and in women and men LH (right hand), oestrogen (right and left hands) and prolactin (right hand) concentrations were positively correlated with 2D:4D ratio and (v) 2D:4D ratio in right hands remained positively related to luteinizing hormone and oestrogen after controlling for sex, age, height and weight.
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            Internet gaming disorder and the DSM-5.

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              Meta-analysis of digit ratio 2D:4D shows greater sex difference in the right hand.

              Our aims are, first, to describe the sex difference in the length ratio of the second and fourth digits (2D:4D), which likely reflects prenatal testosterone levels in humans. Second, to infer the loss of reliability observed in 2D:4D based on self-measured finger lengths. We used random-effects meta-analysis of 2D:4D based on expert-measured finger lengths (116 samples with 13,260 females and 11,789 males). We find a moderate sex difference (with lower 2D:4D for males), which shows substantial heterogeneity (which is unrelated to age). The sex difference is moderated by the type of finger length measurement and by hand. Measurement involving the distortion of soft tissue leads to a significantly larger sex difference than finger length measurement avoiding this. The sex difference in 2D:4D is larger in the right hand than in the left. The reliability of self-measured 2D:4D in the BBC internet study, by far the largest study on 2D:4D, is estimated to be 46% of that of expert-measured 2D:4D. Right-hand 2D:4D might be a better indicator of prenatal androgenisation than left-hand 2D:4D. The view that 2D:4D has allometric properties (Kratochvil L, Flegr J. 2009. Differences in 2nd to 4th digit length ratio in humans reflect shifts along the common allometric line. Biol Lett 5:643-646.) is not supported. Bone lengths contribute to the sex difference in 2D:4D. In addition, there might be a sex difference in fingers' soft tissue, which should be investigated. Because of measurement unreliability, correlations between 2D:4D and variables of interest are about one-third smaller in the BBC internet study than in studies in which 2D:4D is based on expert-measured finger lengths. (c) 2010 Wiley-Liss, Inc.
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                Author and article information

                Contributors
                Journal
                Front Psychiatry
                Front Psychiatry
                Front. Psychiatry
                Frontiers in Psychiatry
                Frontiers Media S.A.
                1664-0640
                07 August 2018
                2018
                : 9
                : 351
                Affiliations
                [1] 1Department of Psychiatry, Chuncheon National Hospital , Chuncheon, South Korea
                [2] 2Mind-Neuromodulation Laboratory, Department of Psychiatry, Hallym University Medical Center , Chuncheon, South Korea
                [3] 3Department of Psychiatry, Akdeniz University , Antalya, Turkey
                [4] 4Department of Psychiatry, Yale School of Medicine, Yale University , New Haven, CT, United States
                [5] 5Neuroscience and Child Study, Yale School of Medicine, Yale University , New Haven, CT, United States
                [6] 6National Center on Addiction and Substance Abuse (CASA Columbia), Yale School of Medicine, Yale University , New Haven, CT, United States
                [7] 7Connecticut Mental Health Center , New Haven, CT, United States
                [8] 8Connecticut Council on Problem Gambling , Wethersfield, CT, United States
                [9] 9The Connecticut Department of Mental Health and Addiction Services, Connecticut Council on Problem Gambling , Wethersfield, CT, United States
                Author notes

                Edited by: Jung-Seok Choi, SMG-SNU Boramae Medical Center, South Korea

                Reviewed by: Sunghwan Yi, University of Guelph, Canada; Changwoo Han, Eulji University, South Korea

                *Correspondence: Sang-Kyu Lee skmind@ 123456hallym.ac.kr

                This article was submitted to Addictive Disorders, a section of the journal Frontiers in Psychiatry

                †Present Address: Yoon-Jung Kim, Gangneung Ana Hospital, Gangwon-do, South Korea

                Article
                10.3389/fpsyt.2018.00351
                6090057
                dff67d89-4adb-4ddc-9290-c4491fd81b0a
                Copyright © 2018 Kim, Roh, Lee, Canan and Potenza.

                This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

                History
                : 30 March 2018
                : 13 July 2018
                Page count
                Figures: 0, Tables: 4, Equations: 0, References: 43, Pages: 9, Words: 6061
                Categories
                Psychiatry
                Original Research

                Clinical Psychology & Psychiatry
                adolescent,gender difference,addictive behavior,biomarkers,exploratory behavior,internet

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