Table 2.

Table 2 Ko et al’s proposed diagnostic criteria for Internet addiction 13

A. Six or more of:
1	Preoccupation with Internet activities
2	Recurrent failure to resist the impulse to use the Internet
3	Tolerance: a marked increase in Internet use needed to achieve satisfaction
4	Withdrawal, as manifested by either of the following: a) symptoms of dysphoric mood, anxiety, irritability, and boredom after several days without Internet activity; b) use of Internet to relieve or avoid withdrawal symptoms
5	Use of the Internet for a period of time longer than intended
6	Persistent desire and/or unsuccessful attempts to cut down or reduce Internet use
7	Excessive time spent on Internet activities
8	Excessive effort spent on activities necessary to obtain access to the Internet
9	Continued heavy Internet use despite knowledge of physical or psychological problem caused or exacerbated by Internet use
B. Functional impairment. One or more of:
1	Recurrent Internet use resulting in a failure to fulfill major obligations
2	Impairment in social relationships
3	Behavior violating school rules or laws due to Internet use
C. The Internet addictive behavior is not better accounted for by another disorder