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

Statement: when creatinine was taken into account, 6- to 8-year-olds had higher bpa concentrations than did older children and youth.
Question: which age group had the highest bpa concentrations?
Answer: 6 to 8