Table 3.

Knock-down and 24 hour mortality in contact bioassays on the inside surface of insecticide-treated tents after weathering.

		Unweathered	1 month weathering	2 months weathering	3 months weathering
Knock-down 1 h after exposure	3-minute exposure	100% (100 – 100)	100% (100 – 100)	92.9% (85.2 – 96.8)	81.2% (74.8 – 87.8)
	10-minute exposure	100% (100 – 100)	96.3% (89.3 – 98.8)	85.2% (76.2 – 91.2)	93.0% (88.1 – 96.0)
Mortality 24 h after exposure	3-minute exposure	93.2% (84.8 – 97.2)	100% (100 – 100)	63.5% (52.8 – 73.0)	83.0% (76.7 – 87.8)
	10-minute exposure	97.4% (90.2 – 99.3)	97.6% (90.8 – 99.4)	80.7% (71.1 – 87.6)	91.3% (86.0 – 94.7)

Notes: 1. Mean percentage knock-down, mortality and 95% confidence limits are back-transformed from values calculated by the blocked logistic regression model. 2. Tests on an untreated tent were carried out as a control. 24 hr mortality was never more than 5%.