Topography-derived wetness indices are associated with household-level malaria risk in two communities in the western Kenyan highlands

Table 3 Malaria odds ratios associated with distance to elevation categories

		Controlling for person-time and year			Controlling for person-time, year, and elevation
Elevation category	Elevation values	OR	95% CI		OR	95% CI
		for a 100 m increase in distance			for a 100 m increase in distance
Kipsamoite
1 (highest)	2085–2102	1.022	1.004	1.040	1.001	0.978	1.024
2	2068–2085	1.020	1.000	1.040	0.991	0.964	1.018
3	2051–2068	1.042	1.020	1.063	1.030	0.994	1.067
4	2034–2051	1.051	1.029	1.073	1.048	1.010	1.087
5	2017–2034	1.078	1.042	1.117	1.058	1.003	1.115
6	2000–2017	1.061	1.005	1.119	1.013	0.950	1.081
7	1982–2000	0.962	0.870	1.064	0.979	0.900	1.066
8	1965–1982	0.855	0.776	0.943	0.919	0.781	1.080
9	1948–1965	0.905	0.851	0.962	0.949	0.837	1.077
10 (lowest)	1931–1948	0.957	0.934	0.981	0.976	0.932	1.022
Kapsisiywa
1 (highest)	1996–2005	0.995	0.989	1.002	0.985	0.975	0.994
2	1986–1996	0.995	0.988	1.002	0.984	0.974	0.994
3	1977–1986	1.014	1.002	1.025	1.018	1.003	1.034
4	1967–1977	1.012	0.992	1.032	1.011	0.984	1.040
5	1958–1967	1.005	0.978	1.033	0.994	0.958	1.032
6	1949–1958	1.001	0.970	1.034	0.991	0.954	1.029
7	1939–1949	0.944	0.871	1.023	0.949	0.876	1.028
8	1930–1939	0.953	0.879	1.033	0.959	0.861	1.069
9	1920–1930	0.999	0.984	1.014	1.007	0.987	1.028
10 (lowest)	1911–1920	1.000	0.989	1.012	1.008	0.992	1.024

Odds ratios for the presence of any household malaria in 2003–2004 associated with 100 m increases in distance between houses and the nearest 10 m² grid-cell in each of ten elevation categories.

ISSN: 1475-2875