Fig 1. Area of the of the study, Northwestern Ethiopia: A district in the rural area of Bahir Dar city, the capital of the Amhara Regional State, in the south shore of Lake Tana.

The five villages included in the study are showed. Data about the studied population, age and gender are noted. n = number of population recruited in the village Y = Range of age; $\overline{\mathrm{X}}$ = mean of age; F = female (%) (Map: Sentinel-2 (ESA) image courtesy of the U.S. Geological Survey).