Area based stratified random sampling using geospatial technology in a community-based survey

BMC Public Health

Table 3 Summary of actual sample

Strata	Proposed Sample				Actual Sample					P ^a
Strata	Selected Blocks	Hispanic	Non-Hispanic	Group N	Selected Blocks	Hispanic	Non-Hispanic	Group N	% Hispanic Recruited
Stratum 1 (≤10%) ^b	10	5	55	60	12	3	41	44	7%	1.0^d
Stratum 2 (10–30%)	10	20	40	60	12	15	35	50	30%	0.71^c
Stratum 3 (30–50%)	12	36	12	48	18	33	24	57	58%	0.07^c
Stratum 4 (> 50%)	12	48	0	48	22	55	11	66	83%	0.002^d
Total	44	109	107	216	64	106	111	217

^aComparing the proposed distribution of surveys by ethnicity status to the proportions of surveys completed. P-values > 0.05 indicate that actual proportions did not differ from proposed population based proportions
^bProportion of Hispanic households in each individual block
^cChi-square test
^dFishers exact test

ISSN: 1471-2458