The durability of long-lasting insecticidal nets distributed to the households between 2009 and 2013 in Nepal

Table 3 Mean chemical content and retention of active ingredient (AI) by LLIN brand

	Interceptor	PermaNet 2.0	Yorkool
Active ingredient	Alpha-cypermethrin	Deltamethrin	Deltamethrin
Number of nets	19	10	15
Mean age of nets (months)	46.2	24.4	9.2
Mean chemical content (g/kg), 95% CI^b	0.39 (0.005–0.879)	0.67 (0.28–1.04)	1.15 (0.005–0.879)
Relative standard deviation, %	223.7	80.1	50.6
% mean retention of AI	5.82	47.9	85.2
% nets within the tolerance limits of the target dose	0%	20%	60%

^aThe target doses at baseline (tolerance limits of 25%) are 6.7 (5.025–8.375) g/kg, 1.4 (1.05–1.75) g/kg, and 1.8 (1.35–2.25) g/kg for Interceptor, Yorkool, and PermaNet 2.0 respectively. Within net variation is expressed by the relative standard deviation (RSD%)
^bThe mean insecticide concentration was not significantly different between Yorkool, Interceptor, and PermaNet 2.0 (p > 0.05)

ISSN: 1349-4147