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Table 4 Net effectiveness based on WHO recommended criteria. Optimal effectiveness: KD60 ≥ 95% or mortality ≥ 80%, minimal effectiveness: KD60 ≥ 75% or mortality ≥ 50%.

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

A Proportion of nets with optimal effectiveness 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
69.2 – 100
(40) 37.5
22.7 – 54.2
(40) 42.5
27.0 – 59.1
(40) 15.0
5.7 – 29.8
(40) 45.0
29.3 – 61.5
(38) 10.5
2.9 – 24.8
PermaNet 2nd generation (10) 100
69.2 – 100
(40) 100
91.2 – 100
(40) 97.5
86.8 – 99.9
(40) 97.5
86.8 – 99.9
(38) 71.0
54.1 – 84.6
(40) 90.0
76.3 – 97.2
Conventional net (10) 100
69.2 – 100
(40) 7.5
1.6 – 20.4
Not done Not done Not done Not done
Conventional net retreated (13) 100
75.3 – 100
(34) 61.8
43.6 – 77.6
(11) 45.5
16.8 – 76.6
Not done Not done Not done
B Proportion of nets with minimal effectiveness 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
69.2 – 100
(40) 70.0
53.5 – 83.4
(40) 60.0
43.3 – 75.1
(40) 30.0
16.6 – 46.5
(40) 65.0
48.3 – 79.4
(38) 18.4
7.7 – 34.3
PermaNet 2nd generation (10) 100
69.2 – 100
(40) 100
91.2 – 100
(40) 100
91.2 – 100
(40) 100
91.2 – 100
(38) 92.1
78.6 – 98.3
(40) 100
91.2 – 100
Conventional net (10) 100
69.2 – 100
(40) 25.0
12.7 – 41.2
Not done Not done Not done Not done
Conventional net retreated (13) 100
75.3 – 100
(34) 73.5
55.6 -87.1
(11) 72.7
39.0 – 99.9
Not done Not done Not done