Table 1. Sample stratified random sub-areas, the total area of study. Tucumanzal district, city of Porto Velho, Rondônia, 2011.

Subarea	No. Inhabitants	Sample	% (sample)
AO	323	66	13.5
A1	546	117	23.9
A2	442	90	18.4
A3	301	66	13.5
A4	737	151	30.7
Total	2,349	490	100