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Description of the thirteen study regions of the The Texas Indoor Radon Survey, 1991.
| Region Name | Region Number | Measurements for Analysis, n |
|---|---|---|
| Southwest Texas | 1 | 208 |
| El Paso | 2 | 97 |
| Big Bend | 3 | 122 |
| West Texas Shales | 4 | 241 |
| North Texas | 5 | 348 |
| Dallas/Fort Worth | 6 | 172 |
| East Texas | 7 | 296 |
| Llano Uplift | 8 | 213 |
| Central Texas (Austin-San Antonio) | 9 | 237 |
| Tertiary Sands Crescent | 10 | 204 |
| Harris County (Houston) | 11 | 122 |
| Gulf Coast | 12 | 215 |
| Texas Panhandle | 13 | 258 |
