Table 1. Deaths and mortality rates among persons internally displaced to a demographic surveillance system area in western Kenya (2007–2008) and among regular residents of the area (1 January to 23 July 2007 and 1 January to 23 July 2008) .

Age group (in years)	IDPs					DSS residents			IDP versus DSS 2007 mortality rate			IDP versus DSS 2008 mortality rate
	No. of deaths	Deaths per 10 000 persons per day	Person–years of observation	Mortality ratea		Mortality ratea 2007	Mortality ratea 2008		RR	95% CI		RR	95% CI
< 5b	37	0.81	1248	29.53		24.69	42.40		1.20	0.85–1.69		0.70	0.50–0.97
5–14	3	0.056	1466	2.05		2.28	2.61		0.90	0.28–2.87		0.78	0.25–2.48
15–49	49	0.37	3009	16.29		12.51	12.13		1.30	0.97–1.75		1.34	1.004–1.80
≥ 50	7	1.6	119	58.77		38.13	39.68		1.54	0.73–3.25		1.48	0.70–3.12
All ages	96	0.45	5869	16.36		15.11	18.14		1.08	0.88–1.33		0.90	0.74–1.11
SMRc									1.33	1.06–1.60		1.01	0.81–1.22

CI, confidence interval; DSS, demographic surveillance system; IDP, internally displaced person; RR, relative risk; SMR, standardized mortality ratio.

^a Deaths per 1000 person–years of observation.

^b Excludes both neonatal deaths and the person–time contribution of neonates (children ≤ 28 days old). Age stratum is 29 days to 59 months.

^C Standardized mortality ratio calculated by the indirect method.