Prevalence of Trachoma in Gambella Region, Ethiopia: Results of Three Population-Based Prevalence Surveys Conducted with the Global Trachoma Mapping Project

Figures & data

Figure 1. Evaluation unit boundaries, Global Trachoma Mapping Project, Gambella, Ethiopia, 2013–2014.

Table 1. Number of clusters (kebeles) selected from each evaluation unit, Global Trachoma Mapping Project, Gambella, Ethiopia, 2013-2014.

Woredas per evaluation unit	Rural population^a, n	Total rural kebeles, n	Selected kebeles^b, n
Makwey	18,086	18	5
Wantawo	24,329	20	6
Akobo	24,044	20	6
Jore	9,686	13	2
Jikawo	25,736	24	7
Total	101,881	95	26
Godere	42,286	12	8
Mengesh	24,883	17	4
Dima	10,073	17	2
Goge	63,543	19	12
Total	140,785	65	26
Abobo	20,078	17	4
Gambella Zuria	10,212	11	2
Etang	48,430	23	11
Lare	39,841	26	9
Total	118,561	77	26

^aRegional health bureau projected estimates from the 2007 Ethiopian Census.

^bNumber of kebeles selected in each woreda was proportional to the woreda population in a given evaluation unit.

Table 2. Characteristics of enumerated individuals, Global Trachoma Mapping Project, Gambella, Ethiopia, 2013-2014.

	Examined, n			Absent, n			Refused, n
Evaluation unit	All	Male	Female	All	Male	Female	All	Male	Female	Total
Makwey, Wantawo, Akobo, Jore, Jikawo	2,790	1,123	1,667	166	124	42	18	7	11	2,974
Godere, Mengesh, Dima, Gog	2,568	1,088	1,480	192	125	67	15	6	9	2,775
Abobo, Gambela Zuria, Etang, Lare	2,660	1,123	1,537	167	95	72	23	7	16	2,850
Total	8,018	3,334	4,684	525	344	181	56	20	36	8,599

Table 3. Prevalences of trachomatous inflammation — follicular (TF) and trichiasis by evaluation unit, Global Trachoma Mapping Project, Gambella, Ethiopia, 2013-2014.

	Age 1-9 years				Age ≥15 years
Evaluation unit	Examined, n	TF cases, n	Unadjusted TF, %	Adjusted^a TF, % (95% CI^b)	Examined, n	Trichiasis cases, n	Unadjusted trichiasis, %	Adjusted^c trichiasis, % (95% CI^b)
Makwey, Wantawo, Akobo, Jore, Jikawo	904	143	15.8	11.5 (7.3-15.3)	1,411	23	1.6	0.8 (0.5-1.2)
Godere, Mengesh, Dima, Gog	1,301	252	19.4	19.3 (15.2-24.2)	1,165	84	7.2	2.4 (1.7-3.3)
Abobo, Gambela Zuria, Etang, Lare	1,119	163	14.6	12.5 (9.1-16.1)	1,205	35	2.9	1.3 (0.7-1.9)
Total	3,324	558	16.6	14.4	3,781	142	3.8	1.5

^aAdjusted for age by year using Gambella Region data from the Ethiopian Census 2007.

^b95% CI estimated by bootstrapping adjusted cluster-level estimates over 10,000 iterations.

^cAdjusted for sex and age in 5-year bands using Gambella Region data from the Ethiopian Census 2007.

CI, confidence interval.

Figure 2. Distribution of trachomatous inflammation – follicular (TF) prevalence in 1–9-year-olds at evaluation unit level, Global Trachoma Mapping Project, Gambella, Ethiopia, 2013–2014.

Figure 3. Distribution of trichiasis prevalence in those aged 15 years or older at evaluation unit level, Global Trachoma Mapping Project, Gambella, Ethiopia, 2013–2014.