Table 1 Determination of feeding-deterrence dose (50 and 90%) of DEET, picaridin, and Xbu compounds against A. aegypti.

RE90 is the relative efficacy of Xbu Peak#3 derived as a ratio of the dose causing 90% reduction in mosquito feeding of DEET or picaridin to that of Xbu Peak#3.

CompoundSlope ± SE50% Feeding-
deterrence dose
(mg/cm2)
95% Fiducial limits90% Feeding-
deterrence dose
(mg/cm2)
95% Fiducial limitsRE90
DEET1.09 ± 0.360.0120.000–0.0320.1780.066–6.7851
Picaridin1.73 ± 0.350.0860.044–0.1560.4710.237–2.0030.38
Xbu Peak#32.08 ± 0.360.0140.010–0.0200.0570.035–0.1498.26