title: Demographic characteristics of the Lambwe Valley population.
abstract: Thirty-four per cent of the population (11,079) in the Lambwe Valley study site was under the age of 10, and 59% were under the age of 20. The population was equally divided among males and females (M/F 0.99). The crude birth rate averaged 45%; the death rate was 8% and the natural increase averaged 37%. Infant and child mortality was 66% and 108% respectively. The average household size was 8.4 individuals. The population migrated to the Lambwe Valley primarily from other areas in Kenya, although 13% were from Tanzania. The predominant tribal group was Luo (59%) followed by the Abasuba (38%). A few Luyha and Kisii were also encountered. Population increased by 3.5-fold in the 1960s, followed by a 2.5-fold increase in the 1970s. Due to an aerial spray tsetse control programme, sleeping sickness had a low prevalence in October 1981 (one of 5749). Of 339 individuals confirmed as sleeping sickness patients by hospital records from within the study site 320 (94.3%) were traced to their homes. Mortality in domestic cattle (40%), goats (47%), sheep (55%), and dogs (50%) had occurred over the previous two years during an outbreak of trypanosomiasis.
authors.affiliation: Walter Reed Project, Veterinary Research Laboratory, Ministry of Agriculture and Livestock Development, Kenya.
authors.forename: B T
authors.initials: BT
authors.lastname: Wellde
authors.forename: M J
authors.initials: MJ
authors.lastname: Reardon
authors.forename: D A
authors.initials: DA
authors.lastname: Chumo
authors.forename: D
authors.initials: D
authors.lastname: Waema
authors.forename: D H
authors.initials: DH
authors.lastname: Smith
authors.forename: D
authors.initials: D
authors.lastname: Koech
authors.forename: T A
authors.initials: TA
authors.lastname: Siongok
authors.forename: L
authors.initials: L
authors.lastname: Wanyama
mesh_terms: D000367:Age Factors; D000818:Animals; D000829:Animals, Domestic; D001723:Birth Rate; D002417:Cattle; D002645:Chickens; D004285:Dogs; D004641:Emigration and Immigration; D005260:Female; D006041:Goats; D006801:Humans; D007226:Infant Mortality; D007630:Kenya / Q000453:epidemiology; D008297:Male; D009026:Mortality; D011153:Population; D011156:Population Density; D011158:Population Growth; D012189:Retrospective Studies; D012737:Sex Factors; D012756:Sheep; D011795:Surveys and Questionnaires; D014353:Trypanosomiasis, African / Q000453:epidemiology*