This study aimed to explore the risk of pathological gambling of legalized Internet gamblers and their possibilities of spread to illegal gambling. In addition, we hoped to shed light on understanding the dysfunction of increasing Internet gambling. To explore the risk of pathological gambling, this study examined the relationships between frequency of gambling behavior and level of problem gambling using a sample of 177 panel members who were selected from an online Internet survey firm. The sample consisted of 108 panel members who participated in legalized Internet gambling and 69 panel members who participated in illegal gambling. The results indicate that the dose-response relationships between frequency of gambling behavior of the legalized Internet gambling group and the level of problem gambling based on DSM-Ⅳ(APA, 1994) were insignificant(r=.061, p>.05), but these relationships in the illegal gambling group were statistically significant(r=.326, p<.01). Furthermore, the index representing symptoms of urge to gamble indicate that both Internet gambling groups were statistically significant(legalized gambling: r=.234, p<.05; illegalized gambling: r=.339, p<.01). In addition, to explore the possibility of gamblers’ spread to illegal gambling, this study examined the relationships between frequencies of both legal and illegal Internet gambling behavior by both types of Internet gambling groups and the results indicated insignificance(r=-.004, p>.05). Differences in starting age of gambling between legal and illegal Internet gambling groups were also investigated, and the results also indicated insignificance(t=-.257, p>.05). Thus, it is concluded that the two types of gambling behavior(legal and illegal) were independent of each other. Finally, we discussed the findings from the results associated with risk management of Internet gambling.
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