3. Results
3.1. Spatial clusters in urban and rural areas
Fig. 2 presents the spatial distribution of TB
patients in urban area. Using the ANN index, it
identified significant nonrandom dispersion of TB
cases into context (ANN index: 0.79 Z
score = 6.4766 and P value = 0.0001) with
observed and expected mean distances of 230
and 292 m, respectively. Visually, three spatial
clusters of TB cases were found during the study
period of which most cases of TB were concentrated
in impoverished and outskirts areas (district
numbers 2 and 3).