Table 1.

Characteristics of the study areas in Western Kenya.

District/Sub-county	Bondo	Mumias	Teso south	Vihiga
Main ethnic group	Luo	Luhya	Teso	Luhya
Agro-ecological zonesa	LM3, LM4, and LM5	LM1	LM1 and LM2	UM1
Population densityb	266	609	460	1,101
Annual mean rainfallb	1,020–1,100 mm	1,800–2,000 mm	1,550–1,800 mm	2,000 mm
Annual mean temperature	22.0–22.7°C	21.0–22.0°C	21.4–22.3°C	18.5–21.0°C

LM3, semi-humid lower midland zones; LM4, transitional lower midland zones; LM5, semi-arid lower midland zones; LM1, humid lower midland zones; LM2, sub-humid lower midland zones; UM, humid upper midland zones.

^aKenya National Bureau of Statistics (36).

^bJaetzold (37).