. Kimberly S. Young Young 1998b 1994 11 Yahoo intenet addiction DSM-IV 4 496 396 100 4.9 38.5 Brenner 1997 32 Internet-Related Addictive Behavior Inventory IRABI 563 55 28 22 Greenfield 2000 Young 1998b Virtual Addiction Survey VAS 1998 ABC abc.com 8 85 17,500 Greenfield 6 119 Anderson n.d. 8 1302 7 1078 106 9.8 1 73 8.5 1 229 26.7 Anderson 1 20 5 10 . Griffiths, 1998, p.63 Morahan-Martin & Schuma