Table 6 Cluster detection analysis results for depression trajectory groups in Galveston and Chambers counties, TX, using the maximum reported spatial window of 40% of the sample population and the multivariate scan statistic.

	LLR	Predictor group	Trajectory group
Cluster 1**			Resilience		Delayed		Recovery		Chronic
Radius			RR	%	RR	%	RR	%	RR	%
3.4km	45.61	55 years or older	0.81	50.0	0.81	10.0	1.10	21.7	2.97	18.3
		non-Hispanic Black	0.46	29.0	5.03	29.0	0.84	16.1	2.24	25.8
		4+ traumatic events before Hurricane Ike	0.54	30.3	0.68	9.1	1.46	33.3	3.39	27.3
		Predisaster probable PTSD	0.32	14.3	0.80	7.1	0.75	21.4	3.20	57.1
		Predisaster probable major depression	0.37	17.9	1.17	14.3	1.16	32.1	2.92	35.7
		Financial loss as a result of Ike	0.80	40.0	0.50	7.30	1.07	25.5	2.36	27.3
		Medium peri-event emotional reactions	0.63	37.5	2.27	20.8	1.24	29.2	1.53	12.5
		High peri-event emotional reactions	0.32	14.3	1.41	17.9	0.61	17.9	3.59	50.0
		Collective efficacy	0.66	44.4	1.56	13.9	1.78	33.3	1.56	8.3
Cluster 2*
2.7 km	35.11	55 years or older	1.76	100	—	—	—	—	—	—
		non-Hispanic Black	2.05	100	—	—	—	—	—	—
		4+ traumatic events before Hurricane Ike	1.78	85.7	—	—	0.27	7.1	0.60	7.1
		Predisaster probable PTSD	2.57	85.7	—	—	—	—	0.53	14.30
		Predisaster probable major depression	2.24	81.8	—	—	0.61	18.2	—	—
		Financial loss as a result of Ike	1.88	85.7	—	—	0.58	14.3	—	—
		Medium peri-event emotional reactions	1.04	57.1	—	—	1.17	28.6	1.64	14.3
		High peri-event emotional reactions	2.94	100	—	—	—	—	—	—
		Collective efficacy	1.45	98.5	—	—	0.49	10.5	—	—

Notes: LLR = Log likelihood ratio, RR = relative risk, computed as the ratio of the proportions of the number of cases in each category out of total number of cases inside the cluster versus outside, % = Percentage of cases falling in each group within in a cluster. Significance codes: p < 0.001 ‘***’p < 0.01 ‘**’p < 0.05 ‘*’p < 0.1 ‘.’ Lowest and Highest RR in bold.

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