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Table 1 Insecticide levels of total sample of collected nets, by site and collection time

From: Estimation of insecticide persistence, biological activity and mosquito resistance to PermaNet® 2 long-lasting insecticidal nets over three to 32 months of use in Ethiopia

Site   No of nets (no tested in bio-assay) Deltamethrin concentration (mg/m2) (by XRF) Mean (SD) No (%) of nets with <10 mg/m2deltamethrin Manufacturer’s reported batch mean deltamethrin concentration (MRBMC) (mg/m2) Difference between field XRF and MRBMC (%)
A   25 (4) 64.7 (13.3) 0 59.9 8.0
B   25 (4) 67.6 (10.8) 0 59.9 12.9
C   25 (4) 69.7 (14.3) 0 59.7 16.8
D   25 (4) 74.8 (12.5) 0 59.7 25.3
E   25 (4) 58.0 (14.3) 0 60.0 -3.3
F   25 (4) 58.1 (20.0) 1 (4) 60.0 -3.2
G   5 (0) 76.9 (5.6) 0 58.9 30.6
H   14 (0) 72.9 (9.5) 0 58.9 23.8
J   20 (4) 63.8 (8.6) 0 60.9 4.8
  3–6 months 189 (28) 66.2 (14.6) 1 (0.5) 59.8* 10.8
K   20 (4) 53.2 (15.9) 0 59.9 -11.2
L   20 (4) 38.1 (19.9) 1 (5) 59.1 -35.5
M   20 (4) 58.5 (14.7) 0 59.1 -1.0
N   20 (4) 41.6 (19.3) 1 (5) 59.7 -30.3
P   20 (4) 46.9 (19.9) 0 57.7 -18.7
Q   20 (4) 48.1 (19.0) 0 59.1 -18.6
R   20 (4) 30.7 (26.8) 6 (30) 60.0 -48.8
S   20 (4) 50.4 (26.0) 1 (5) 61.0 -17.4
T   20 (4) 47.1 (18.0) 0 58.9 -20.0
U   20 (4) 41.6 (19.3) 1 (5) 59.1 -29.6
J   20 (4) 28.7 (14.5) 2 (10) 60.9 -52.9
  14-20 months 220 (44) 44.1 (21.2) 12 (5.5) 59.5* -25.9
K   20 (4) 40.0 (19.3) 2 (10) 59.9 -33.2
L   20 (4) 46.6 (13.9) 0 59.1 -21.2
M   20 (4) 54.3 (21.1) 0 59.1 -8.1
N   20 (4) 34.1 (14.7) 0 59.7 -42.9
P   20 (4) 35.5 (16.6) 1 (5) 57.7 -38.5
Q   20 (4) 42.0 (18.7) 0 59.1 -28.9
R   20 (4) 32.5 (18.0) 4 (20) 60.0 -45.8
S   20 (4) 45.3 (20.7) 0 61.0 -25.7
T   20 (4) 38.0 (14.0) 0 58.9 -35.5
U   20 (4) 42.4 (23.2) 1 (5) 59.1 -28.3
  26-32 months 200 (40) 41.1 (18.9) 8 (4.0) 59.4* -30.8
  1. *Average of the sites in the time group of collection.