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The relationship between the power of the long-lasting insecticidal net trial to detect a difference between nets causing 70% and 80% mortality and its duration in number of 6-week rotations of the Latin square. Each power estimate was derived from 1000 simulated data sets, generated under scenarios that varied in Anopheles gambiae abundance, degree of variation in mortality between huts and weeks, and strength of overdispersion. The horizontal grey line shows the target power of 80%.
