The effects of the Omagh bomb on adolescent mental health: a school-based study

BMC Psychiatry

Table 2 Caseness rates according to the Posttraumatic Diagnosis Scale (PDS > 20) and the General Health Questionnaire (GHQ > 3)

	PDS Cases (percentage of 2095 valid responses)				GHQ Cases (percentage of 2155 valid responses)
	N	%	OR	CI	N	%	OR	CI
No exposure	22	1.7	-	-	181	13.4
Near miss	6	5.3	3.86**	1.50-9.95	24	20.5	1.75*	1.06-2.89
Loss	17	4.8	2.79**	1.45-5.38	68	18.5	1.40*	1.02-1.92
Witness	48	17.3	13.75**	7.86-24.08	93	32.5	3.20**	2.31-4.44
Present	10	32.3	26.55**	8.32-84.63	13	39.4	4.07*	1.62-10.24
Total	103	4.9			379	17.6

Note: OR = odds ratio for probable caseness compared to the no exposure group. CI = the 95% confidence interval for the OR estimate. *p < 0.05; ** p < 0.01. In the calculation of the OR, the logistic model controlled for gender, age and family structure and having a missing value on any of the items used in the construction of the exposure scale (parameter estimates for these covariates are not shown). N is restricted to those with valid responses on the PDS and the GHQ.

ISSN: 1471-244X