| 1 | A | B | C | D |
| --- | --- | --- | --- | --- |
| 2 | geometric means of urinary bpa concentrations, by selected characteristics, household population aged 6 to 17, canada, 2007/2009 and 2009/2011 |  |  |  |
| 3 | characteristics | geometric mean | 95% confidence interval |  |
| 4 |  |  | from | to |
| 5 | total | 1.3 | 1.1 | 1.4 |
| 6 | age group |  |  |  |
| 7 | 6 to 8 | 1.8 | 1.6 | 2.1 |
| 8 | 9 to 11 | 1.4 | 1.2 | 1.7 |
| 9 | 12 to 14 | 1.2 | 1.0 | 1.4 |
| 10 | 15 to 17 | 0.9 | 0.8 | 1.1 |
| 11 | sex |  |  |  |
| 12 | male | 1.2 | 1.1 | 1.4 |
| 13 | female | 1.3 | 1.2 | 1.5 |
| 14 | time of urine collection |  |  |  |
| 15 | morning | 1.1 | 1.0 | 1.3 |
| 16 | afternoon | 1.5 | 1.3 | 1.7 |
| 17 | evening | 1.4 | 1.0 | 1.7 |
| 18 | ethnicity |  |  |  |
| 19 | white | 1.3 | 1.2 | 1.5 |
| 20 | non-white | 1.3 | 1.0 | 1.6 |
| 21 | exposure to second-hand smoke |  |  |  |
| 22 | once a week or less | 1.2 | 1.1 | 1.4 |
| 23 | every day or almost every day | 1.6 | 1.4 | 2.0 |
| 24 | household income |  |  |  |
| 25 | low/lower-middle | 1.7 | 1.4 | 2.0 |
| 26 | upper-middle | 1.2 | 1.0 | 1.4 |
| 27 | highest | 1.2 | 1.1 | 1.4 |
| 28 | household education |  |  |  |
| 29 | secondary school graduation or less | 1.3 | 1.0 | 1.6 |
| 30 | at least some postsecondary | 1.3 | 1.1 | 1.5 |
| 31 | body mass index |  |  |  |
| 32 | neither overweight nor obese | 1.3 | 1.2 | 1.5 |
| 33 | overweight | 1.3 | 1.0 | 1.7 |
| 34 | obese | 1.2 | 1.0 | 1.4 |

Question: what was the mean urinary bpa concentration of the sample?
Answer: 1.3

Question: which age group had the highest bpa concentrations?
Answer: 6 to 8

Question: list the household income with the highest bpa concentrations.
Answer: low/lower-middle