The western Kenya insecticide-treated bed net trial
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645


We measured the two-week household-level economic impact of insecticide (permethrin)-treated bed nets (ITNs) used to prevent malaria among children less than five years of age in Asembo, Kenya. The ITNs induced a two-week reduction of 15 Kenyan shillings (KSH) (U.S. $0.25; < 0.0001) in health care expenditures, but a statistically insignificant 0.5 day ( = 0.280) reduction in household time lost due to caring for sick children. The equivalent annual threshold cost was estimated at U.S. $6.50 (95% confidence interval = 3.12–9.86). If the actual purchase price and maintenance costs of ITNs were greater than this threshold, then households would pay more than they would save (and vice-versa). Both seasonal effects and number of children per household had larger impacts than ITNs on health care expenditures and time lost from household activities. Health care expenditures by a household without ITNs and one child were only 32 KSH per two weeks (U.S. $0.50; = 0.002), leaving little opportunity for household-level, ITN-induced direct savings. The widespread adoption of the ITNs will therefore probably require a subsidy.


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