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Table 2 Analysis of the parasitaemia results of 17 specimens containing Plasmodium falciparum

From: Estimating the parasitaemia of Plasmodium falciparum: experience from a national EQA scheme

No Reference mean parasitaemia Participants mean parasitaemia Standard deviation No. and % of participants reporting parasitaemia > reference mean % over estimating parasitaemia % under estimating parasitaemia % not specifying parasitaemia Incorrect Plasmodium species reported
1 0.1% 0.5% 0.4 136 (62%) 12% 0% 22 (10%) P. vivax 16/217 (7%)
P. ovale 10/217 (5%)
2 0.25% 0.4% 0.3 105 (49%) 17% 0% 50 (19%) P. vivax 44 (17%)
P. ovale 37 (14%)
P. malariae 13 (5%)
3 1.1% 1.4% 0.57 116 (42%) 18% 5% NA* None
4 1.4% 1.5% 0.69 85 (43%) 14% 2% 74 (27%) P. vivax 1/198 (0.3%)
P. malariae 1 (0.3%)
5 1.8% 2.3% 0.8 123 (59%) 15% 10% 58 (22%) P. vivax 15/266 (6%)
P. ovale 5
(2 %)
P. malariae 3 (1%)
6 2.5% 2.8% 1.3 75 (44%) 11% 8% NA* P. vivax 5/170 (3%)
P. ovale 2/170 (1%)
7 2.5% 3% 1.3 127 (62%) 14% 3% 66 (24%) P. vivax 10/271 (4%)
P. ovale 1 (0.4%)
P. malariae 2 (0.7%)
8 2.5% 3% 1 138 (66%) 19% 2% 49 (19%) P. vivax 7 (3%)
9 3% 3.5% 1.1 68 (66%) 12% 4% 170 (54%) P. malariae 1/236 (0.4%)
10 5% 5.8% 2 91 (51%) 13% 10% 66 (27%) P. vivax 3/243 (1%)
P. ovale 4 (1.6%)
P. malariae 20 (8%)
11 7.5% 11.8% 4.4 98 (35%) 9% 4% NA* P. ovale 1/115 (1%)
12 9% 9.2% 2.5 92 (45%) 20% 19% 53 (21%) None
13 10.5% 11.5% 3.4 96 (54%) 30% 3% 79 (31%) P. ovale 1/256 (0.4%)
P. malariae 1 (0.4%)
14 16% 18% 4.5 130 (57%) 35% 3% 9 (4%) P. vivax 2/226 (1%)
15 20% 24.2% 4.6 99 (46%) 33% 4% NA* None
16 20% 20.8% 6.7 120 (40%) 25% 0 NA* P. vivax 1/300 (0.3%)
17 30% 32% 10 80(39%) 10% 25% 52 (21%) P. vivax 1/253 (0.4%)
(Babesia sp. 4 (2%))
  1. NA* Not applicable (see text below). Specimen 8 also contained trophozoites of P. ovale and specimen 14 also contained trophozoites of P.vivax.