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Table 2 Characteristics of study participants and mean prevalence estimated from the raw data of STH over four years of monitoring in 19 extension sentinel sites in Burundi. The last column contains data collected for a mapping survey in 2014 at 14 of the 19 extension schools. Added in parentheses are the standard errors for the raw mean prevalence \( \left(\sqrt{\frac{\widehat{p}\left(1-\widehat{p}\right)}{n}}\right) \) and the raw intensity means \( \left(\frac{\widehat{sd}}{\sqrt{n}}\right) \), respectively

From: The impact of an 8-year mass drug administration programme on prevalence, intensity and co-infections of soil-transmitted helminthiases in Burundi

Year 2008 2009 2011 2014
Number of participants 5,700 6,378 8,869 700
Mean age 10.98 10.48 11.03 13.33
Gender ratio (F:M) 0.50 0.50 0.52 0.50
Raw mean prevalence
Pooled STH 0.35 (0.006) 0.26 (0.005) 0.16 (0.004) 0.20 (0.015)
Ascaris 0.20 (0.005) 0.10 (0.004) 0.09 (0.003) 0.10 (0.011)
Trichuris 0.10 (0.004) 0.10 (0.004) 0.04 (0.002) 0.03 (0.006)
Hookworm 0.14 (0.005) 0.09 (0.004) 0.05 (0.002) 0.08 (0.010)
Raw mean intensity of infected pupils only
Ascaris 2,081 (178) 1,147 (191) 1,581 (138) 1,084 (258)
Trichuris 122 (9) 106 (12) 86 (6) 45 (6)
Hookworm 100 (11) 85 (6) 120 (13) 151 (36)
Intensity of infection (uninfected/light/moderate/heavy): n (%)
Ascaris 4,581/1,002/114/3 5,702/637/30/1 8,059/732/50/1 628/69/3/0
  (80/18/2/0) (90/10/0/0) (91/8/1/0) (90/10/0/0)
Trichuris 5,150/542/6/0 5,736/628/6/0 8,478/362/2/0 682/18/0/0
  (90/10/0/0) (90/10/0/0) (96/4/0/0) (97/3/0/0)
Hookworm 4,907/790/0/1 5,823/546/1/0 8,425/412/4/0 645/55/0/0
  (86/14/0/0) (91/9/0/0) (95/5/0/0) (92/8/0/0)