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Table 2 Results from chemical residue analysis. Median deltamethrin residue (in mg/m2) and the proportion of nets with a deltamethrin concentration of at least 4 mg/m2.

From: Long-term field performance of a polyester-based long-lasting insecticidal mosquito net in rural Uganda

A Average net chemical residue in mg/m2 at different times of follow-up
Type of net Baseline (n) Median IQR 6 Months (n) Median IQR 12 Months (n) Median IQR 18/20 Months (n) Median IQR 24/27 Months (n) Median IQR 36/39 Months (n) Median IQR
PermaNet 1st generation (10) 47.5
32.9 – 52.2
(40) 2.5
1. 6 – 7.1
(40) 2.1
0.7 – 3.9
(43) 1.0
0.5 – 2.8
(40) 1.6
0.8 – 3.3
(38) 0.5
0.3 – 0.9
PermaNet 2nd generation (10) 69.2
56.8 – 75.4
(40) 65.6
58.1 – 78.5
(40) 55.8
39.1 – 82.4
(40) 44.5
34.5 – 67.4
(38) 32.3
21.4 – 48.7
(40) 28.7
11.2 – 37.9
Conventional net (10) 16.9
10.0 – 25.4
(40) 0.7
0.4 – 1.4
Not done Not done Not done Not done
Conventional net retreated (13) 42.8
12.5 – 77.1
(34) 3.1
1.6 – 11.5
(11) 1.4
0.3 – 26.4
Not done Not done Not done
B Proportion of nets with deltamethrin ≥ 4 mg/m 2 at different times of follow-up
Type of net Baseline (n) % 95% CI 6 Months (n) % 95% CI 12 Months (n) % 95% CI 18/20 Months (n) % 95% CI 24/27 Months (n) % 95% CI 36/39 Months (n) % 95% CI
PermaNet 1st generation (10) 100
66.2 – 100
(40) 40.0
24.9 – 56.7
(40) 22.5
10.8 – 38.5
(43) 15.0
5.6 – 29.8
(40) 17.5
7.3 – 32.8
(38) 5.3
0.1 – 17.7
PermaNet 2nd generation (10) 100
66.2 – 100
(40) 100
91.2 – 100
(40) 100
91.2 – 100
(40) 100
91.2 – 100
(38) 97.4
86.2 – 99.9
(40) 90.0
76.3 – 97.2
Conventional net (10) 100
66.2 – 100
(40) 5.0
0.6 – 16.9
Not done Not done Not done Not done
Conventional net retreated (13) 100
75.3 – 100
(34) 47.1
29.8 -64.9
(11) 45.5
16.7 – 76.6
Not done Not done Not done