Characteristic ADHD Non ADHD Group T Test Group N= 40 N= 77 T DDL p value   Mean SD Mean SD Age 42,70 10,63 43,50 12,40 -0,752 2-111 ns Age at beginning 19,80 7,16 24,70 10,30     * Tobacco : cig./day 16,60 11,20 11,70 12,30 2,19 2-112 0,03 Tobacco : cig./Before 1,12 0,32 1,34 0,51 -2,32 févr-93 0,02

Characteristic ADHD Non ADHD Group   T Test (criterion yes) Group N= 40 N= 77 Total   T DDL p value criterion Yes No Yes No   Number % number % Number % number %  Cannabis 15 13,64 25 22,73 9 8,18 61 55,45 110 -2,56 2-109 0,012 Ecstasy 2 1,83 37 33,94 3 2,75 67 61,47 109 0,341 2-108 0,733 Heroin 5 4,55 35 31,82 8 7,27 62 56,36 110 0,216 2-109 0,829 Cocaine 4 3,64 36 32,73 6 5,45 64 58,18 110 0,188 2-109 0,851 Alcool 32 28,83 8 7,21 53 47,75 18 16,22 111 -0,41 2-110 0,679 Bulimia nervosa 9 7,89 32 28,07 22 19,30 51 44,74 114 0,938 2-112 0,082 Anorexie 4 3,51 37 32,46 15 13,16 58 50,88 114 1,485 2-112 0,14 Compulsive buying 10 8,77 31 27,19 14 12,28 59 51,75 114 -0,65 2-112 0,517

Table 1: Demographic and clinical characteristics.

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