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Table 4 Proportion (%) of prozone for Paracheck-Pf according to different denominators, 95% binomial confidence intervals (CI) within brackets

From: Prozone in malaria rapid diagnostics tests: how many cases are missed?

Category Number % of patients suspected of malaria % of P. falciparum positive patients % of samples with high parasitaemia
Patients suspected of malaria
(1 sample per patient included)
7,543 100   
Samples positive for P. falciparum 873 11.6
(10.86-12.32)
100  
Samples scored as 4+ or 5 + (MoH semi-quantitative scale) 410 5.4
(4.93-5.97)
47.0
(43.61-50.34)
 
Samples with a high parasitaemia (parasite density ≥ 4%) 92 1.2
(0.98-14.9)
10,5
(8,58-12,77)
100
Number of samples available for prozone testing 76 - - -
Negative, faint or weak HRP-2 test lines * 29 0.5
(0.32-0.64)
4.0
(2.81-5.53)
38.0
(28.12-48.76)
Negative or faint HRP-2 test lines * 8 0.1
(0.06-0.24)
1.2
(0.55-2.10)
10.9
(5.34-19.08)
Negative HRP-2 test lines * 3 0.05
(0.01-0.14)
0.5
(0.12-1.17)
4.4
(1.20-10.76)
  1. * Line intensity for undiluted samples
  2. Proportions calculated according to Table 2, corrected for the number of samples that were not available for prozone testing (n = 16).