geometric means of urinary bpa concentrations, by selected characteristics, household population aged 6 to 17, canada, 2007/2009 and 2009/2011
Table:
characteristics
geometric mean
95% confidence interval

from
to

total
1.3
1.1
1.4

age group

6 to 8
1.8
1.6
2.1

9 to 11
1.4
1.2
1.7

12 to 14
1.2
1.0
1.4

15 to 17
0.9
0.8
1.1

sex

male
1.2
1.1
1.4

female
1.3
1.2
1.5

time of urine collection

morning
1.1
1.0
1.3

afternoon
1.5
1.3
1.7

evening
1.4
1.0
1.7

ethnicity

white
1.3
1.2
1.5

non-white
1.3
1.0
1.6

exposure to second-hand smoke

once a week or less
1.2
1.1
1.4

every day or almost every day
1.6
1.4
2.0

household income

low/lower-middle
1.7
1.4
2.0

upper-middle
1.2
1.0
1.4

highest
1.2
1.1
1.4

household education

secondary school graduation or less
1.3
1.0
1.6

at least some postsecondary
1.3
1.1
1.5

body mass index

neither overweight nor obese
1.3
1.2
1.5

overweight
1.3
1.0
1.7

obese
1.2
1.0
1.4

Respond the following question with the most concise answer possible from the table. Return the answer in the JSON form {"answer": ["YOUR ANSWER"]}; for multiple items, use commas. 'geometric means of urinary bpa concentrations, by selected characteristics, household population aged 6 to 17, canada, 2007/2009 and 2009/2011' is the caption of the table. Based on the table, answer the question: Which age group had the highest bpa concentrations?

{"answer": ["6 to 8"]}