NEW UPDATE: Completed trials may now upload and register supplementary documents (e.g. null results reports, populated pre-analysis plans, or post-trial results reports) in the Post Trial section under Reports, Papers, & Other Materials.
Commercial Viability of Malaria Control: The Outgrower Opportunity
Initial registration date
Not yet registered
December 15, 2013 3:31 AM EST
University of Oxford
Other Primary Investigator(s)
Additional Trial Information
The study evaluates whether the sourcing of insecticide-treated nets and their distribution to smallholder farmers for free would be a profitable investment for a cotton outgrowing agribusiness in Zambia.
Distribution of Insecticide-treated mosquito nets
Intervention Start Date
Intervention End Date
Primary Outcomes (end points)
Cotton yields, contract defaults, Increase in maize productivity, self-reported malaria incidence
Primary Outcomes (explanation)
See clinicaltrials.gov registration NCT01397851
Secondary Outcomes (end points)
Secondary Outcomes (explanation)
Treatment: Insecticide-treated net
Smallholder farmers in the treatment group are informed that they won a raffle, and receive a free insecticide-treated net
Device: Insecticide-treated net (BASF Incerceptor) One per farmer, once during the 2010-2011 season
No Intervention: Control Smallholder farmers in the control group are informed that they had a chance to win an insecticide-treated mosquito net in a raffle, but did not end up winning
Experimental Design Details
Cluster (Dunavant Distributor)
Was the treatment clustered?
Sample size: planned number of clusters
Sample size: planned number of observations
Sample size (or number of clusters) by treatment arms
39963 farmers in 739 clusters: treatment
41634 farmers in 768 clusters: control
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
given preliminary data on available intracluster correlation and likely available nets as of September 2010, the MDE on was estimated to be 7$ in absolute terms. see protocol for details.
INSTITUTIONAL REVIEW BOARDS (IRBs)
IRB Approval Date
IRB Approval Number
Post Trial Information
Is the intervention completed?
Intervention Completion Date
December 28, 2011, 12:00 AM +00:00
Is data collection complete?
Data Collection Completion Date
December 01, 2012, 12:00 AM +00:00
Final Sample Size: Number of Clusters (Unit of Randomization)
Was attrition correlated with treatment status?
Final Sample Size: Total Number of Observations
Final Sample Size (or Number of Clusters) by Treatment Arms
739 T, 768 C
Reports, Papers & Other Materials
PRIVATE SECTOR PERSPECTIVE (DUNAVANT): ECONOMIC EFFECTS
Sedlmayr, Richard, On the Economic Impact of Malaria Control, Some Discordant Evidence (November 21, 2013). Available at SSRN: http://ssrn.com/abstract=2358045
PUBLIC SECTOR PERSPECTIVE (NMCP): HEALTH EFFECTS
Sedlmayr, R., Fink, G., Miller, J. M., Earle, D., & Steketee, R. W. (2013). Health impact and cost-effectiveness of a private sector bed net distribution: experimental evidence from Zambia. Malaria Journal, 12:102 .
REPORTS & OTHER MATERIALS