Epidemiology of soil-transmitted helminth infections and the differential effect of treatment on the distribution of helminth species in rural areas of Gabon

Table 3 Incidence proportion (I_P) and incidence rate (I_R) of STH species over the study course

	First follow-up phase, 6 months							Second follow-up phase, 9 months							p-value*
	N	n	I_P (%)	95%CI	E.T	I_R	95%CI	N	n	I_P (%)	95%CI	E.T	I_R	95%CI	p-value*
Any STH species	124	23	18.5	12.3–26.7	56.2	40.9	28.0–54.8	146	51	34.9	27.4–43.3	90.4	56.4	45.6–66.8	0.001
Ascaris lumbricoides	105	7	6.7	2.9–13.7	50.7	13.8	5.7–26.4	146	16	11.0	6.6–17.5	103.5	15.5	9.1–23.9	0.09
Trichuris trichiura	85	6	7.1	2.9–15.3	41.0	14.6	5.6–29.2	146	35	24.0	17.5–31.9	96.4	36.3	26.8–46.7	< 0.001
Hookworm	109	7	6.4	2.8–13.2	52.7	13.3	5.5–25.4	146	13	8.9	5.0–15.0	104.6	12.4	6.8–20.3	0.26
Strongyloides stercoralis	115	9	7.8	3.9–14.7	55.2	16.3	7.7–28.7	146	3	2.0	0.5–6.3	108.4	2.8	0.6–7.9	0.15

*p-value using binom.test of stats r package comparing the Ip and I_R at the two time points
N: Total number of participants considered as negative at the beginning of the follow-up phase and for the respective species; n: Total number of positive participants; E.T: Exposure time expressed in 100 person-year

ISSN: 1349-4147