Table 1.

Demographic data

	Males n (%)	Females n (%)	p-value	Total n (%)
Known ID	1125 (97)	694 (99)	0.002*	1819 (98)
Unknown ID	32 (3)	5 (1)	0.002*	37 (2)
Episodes:
1	958 (83)	635 (91)	< 0.001*	1593 (86)
2-5	152 (13)	56 (8)	< 0.001*	208 (11)
6-22	15 (1)	3 (< 0.5)	ns	18 (1)
Age:
16-25	274 (24)	311 (44)	< 0.001*	585 (32)
26-35	303 (26)	152 (22)	0.035*	455 (25)
36-45	243 (21)	102 (15)	< 0.001*	345 (19)
46-55	173 (15)	69 (10)	0.002*	242 (13)
56-65	89 (8)	33 (5)	0.014*	122 (7)
66-75	33 (3)	15 (2)	ns	48 (3)
> 75	15 (1)	13 (2)	ns	28 (2)
Unknown	27 (2)	4 (1)	0.004*	31 (2)
Residency:
Oslo	757 (65)	528 (76)	< 0.001*	1285 (69)
Outside Oslo	328 (28)	158 (23)	0.007*	486 (26)
Homeless	20 (2)	2 (0)	0.006*	22 (1)
Outside Norway	22 (2)	6 (1)	ns	28 (2)
Unknown	30 (3)	5 (1)	0.004*	35 (2)
Total individuals	1157 (100)	699 (100)		1856 (100)

* Significant

ID: identification