. Author manuscript; available in PMC: 2010 Aug 17.

Published in final edited form as: J Trauma Stress. 2009 Apr;22(2):91–101. doi: 10.1002/jts.20389

Table 4.

Trauma Exposure and Katrina-Related PTSD Symptoms: Results of Poisson (Negative Binomial) Regression Analyses (n = 80)

	Model 1			Model 2			Model 3			Model 4

	B	(SE B)	χ²	B	(SE B)	χ²	B	(SE B)	χ²	B	(SE B)	χ²
Background variables
Pre-Katrina mental health	−0.04	(0.13)	< 1	−0.08	(0.13)	< 1	−0.20	(0.14)	1.99	−0.22	(0.14)	2.58
Time in transition camp	−0.07	(0.12)	< 1	−0.09	(0.11)	< 1	0.04	(0.12)	< 1	0.02	(0.11)	< 1
Age	0.05	(0.02)	5.14^*	0.05	(0.02)	4.37^*	0.04	(0.02)	5.31^*	0.05	(0.02)	7.15^**
Acculturation	−0.12	(0.04)	10.48^***	−0.11	(0.03)	10.25^***	−0.10	(0.03)	9.55^**	−0.08	(0.03)	7.01^**
Objective exposure to Katrina
Exposure to flood waters				0.272	(0.137)	3.95^*	0.27	(0.14)	3.91^*	0.16	(0.16)	1.08
Severity of property damage				0.431	(0.116)	13.83^***	0.41	(0.11)	14.43^***	0.32	(0.13)	5.74^*
Subjective trauma exposure
Traumatized men							0.91	(0.28)	10.38^***	0.90	(0.29)	9.99^**
Traumatized women							1.40	(0.28)	24.32^***	1.41	(0.29)	23.80^***
Interactions
Flood exposure by time in transition camp										−0.06	(0.12)	< 1
Property damage by time in transition camp										0.23	(0.12)	3.90^*
Model statistics
Deviance χ²/df = ratio	74.08/75 = 0.99			64.42/73 = 0.88			52.60/71 = 0.74			50.61/69 = 0.73
Pearson χ²/df = ratio	51.93/75 = 0.69			45.01/73 = 0.62			38.94/71 = 0.55			37.88/69 = 0.55
Omnibus test likelihood ratio χ² (df)	χ² (4) = 13.59^**			χ² (6) = 23.24^***			χ² (8) = 35.07^***			χ² (10) = 37.06^***

Note. PTSD = posttraumatic stress disorder. The dependent variable is the number of B, C, and D symptoms, which had a potential range of 0 – 17 and an actual range of 0 (25%) to 16 (1%). Model omnibus test is against intercept-only model. Subjective trauma exposure was a categorical variable with untraumatized men as the reference category.

p < .05.

^**

p < .01.

^***

p < .001.