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. Author manuscript; available in PMC: 2015 Dec 30.
Published in final edited form as: Hum Factors. 2014 Aug;56(5):873–910. doi: 10.1177/0018720813516359

Table 2. Sampling Plan With Equal Racial/Ethnic Distribution Across the Four Regions.

Age Total
Male Female
White Black Hispanic/Other
Data Collection Site 18–32 33–44 45–65 18–32 33–44 45–65 18–32 33–44 45–65 18–32 33–44 45–65
Phoenix, AZ 45 45 45 7 7 7 7 7 7 7 7 7 198
Chicago, IL 52 52 52 7 7 7 7 7 7 7 7 7 219
Rockville, MD 53 53 53 7 7 7 7 7 7 7 7 7 222
Fort Worth, TX 60 60 60 9 9 9 9 9 9 9 9 9 261
Total 630 90 90 90 900