Table 2. Prevalence and incidence of geohelminths in the studied population, before and after the city-wide sanitation intervention.
Geohelminths | Prevalence | Incidence | ||||||||||
1997 (n = 729) | 2003 (n = 890) | p* | 1997–1998 | 2003–2004 | p* | |||||||
pos | % | pos | % | n** | pos# | % | n** | pos# | % | |||
Ascaris lumbricoides | 241 | 33.1 | 227 | 25.5 | 0.001 | 488 | 100 | 20.5 | 663 | 101 | 15.2 | 0.02 |
Trichuris trichiura | 313 | 42.9 | 256 | 28.8 | 0.001 | 416 | 46 | 11.1 | 634 | 56 | 8.8 | 0.23 |
Hookworms | 72 | 9.9 | 15 | 1.7 | 0.001 | 657 | 15 | 2.3 | 875 | 12 | 1.4 | 0.18 |
Any geohelminth | 390 | 53.5 | 356 | 40.0 | 0.001 | 400 | 144 | 36.0 | 584 | 150 | 25.7 | 0.001 |
* Difference between periods = test χ2.
** n = negative in first exam.
# pos = positive in the second exam.