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
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) | |