Table 2.

Factors associated with repeated self-harm within 12 months of an intentional drug overdose presentation

Factor	Repetition N (%)	Adjusted OR	95% CI
Gender
Male	2454 (17.3)	1.08*	1.01 to 1.16
Female	3014 (15.3)	1.00	Ref
Age group (years)
<15	119 (16.7)	1.78***	1.35 to 2.35
15–24	1595 (14.9)	1.44***	1.23 to 1.68
25–34	1332 (16.5)	1.38***	1.18 to 1.62
35–44	1296 (18.5)	1.59***	1.36 to 1.86
45–54	785 (16.8)	1.40***	1.18 to 1.65
55+	341 (12.5)	1.00	Ref
Alcohol	2555 (16.9)	1.15***	1.07 to 1.23
Self-cutting	502 (26.3)	1.94***	1.69 to 2.22
Tablets taken
<10	586 (15.4)	1.00	Ref
10–19	1019 (14.5)	1.00	0.89 to 1.12
20–29	810 (15.1)	1.04	0.92 to 1.17
30–39	503 (16.6)	1.13	0.99 to 1.29
40–49	383 (18.7)	1.30***	1.12 to 1.50
50–59	209 (17.9)	1.20*	1.00 to 1.44
60–69	161 (18.5)	1.26*	1.03 to 1.54
70–79	72 (14.5)	0.88*	0.67 to 1.16
80+	240 (17.3)	1.12	0.94 to 1.33
Admission
General ward	2130 (15.7)	1.00	Ref
Psychiatric ward	587 (25.1)	1.75***	1.55 to 1.99
Patient refused admission	70 (17.8)	1.12	0.82 to 1.52
Patient left without recommendation	678 (17.9)	1.16*	1.03 to 1.31
Not admitted	2003 (14.5%)	0.93	0.86 to 1.01
Drug-type
Salicylate	98 (12.2)	0.80	0.63 to 1.03
Salicylate compound	77 (12.1)	0.92	0.71 to 1.19
Paracetamol	983 (13.4)	0.98	0.89 to 1.07
Paracetamol compound	450 (12.9)	0.91	0.68 to 1.23
Opiate	284 (16.2)	1.10	0.94 to 1.29
Opiate compound	407 (13.2)	0.97	0.70 to 1.33
NSAID	685 (13.6)	0.96	0.86 to 1.06
Minor tranquilliser	2548 (19.5)	1.55***	1.44 to 1.68
Major tranquilliser	551 (22.8)	1.56***	1.38 to 1.76
SSRI	802 (18.4)	1.16**	1.05 to 1.28
TCAD	75 (14.5)	0.98	0.73 to 1.31
Other antidepressants	469 (19.1)	1.26***	1.11 to 1.42
Antiepileptic/barbiturate	291 (22.6)	1.54***	1.31 to 1.81
Other drugs	1341 (15.6)	1.06	0.97 to 1.16
Street drugs	374 (18.5)	1.12	0.94 to 1.34
Country
Ireland	4868 (15.9)	1.00	Ref
Northern Ireland	600 (17.9)	1.24***	1.10 to 1.39

*p<0.05; **p<0.01; ***p<0.001.