Table:
characteristics
currently working in a noisy environment
vulnerable to noise

number '000
%
95% confidence interval
number '000
%
95% confidence interval

from
to
from
to

total
3,550
13.8
11.8
16.0
1,776
50.1
42.4
57.9

sex

men
2,709
21.2
17.9
25.1
1,148
42.4
33.9
51.3

women
842
6.5
4.9
8.5
628
75.3
61.4
85.3

employment

employee
3,026
18.9
16.2
21.9
1,411
46.7
38.5
55.2

self-employed / unpaid family business
477
15.0
10.2
21.6
344
72.1
58.3
82.7

occupational category

white-collar
1,457
10.2
8.7
11.9
960
66.2
55.9
75.2

blue-collar
1,895
52.1
44.4
59.7
729
38.5
26.4
52.2

Statement: people in blue-collar occupations were less likely than those in white-collar occupations to be vulnerable to excessive noise.
Question: which kind of occupational category is less likely to be vulnerable to excessive noise, blue-collar or white-collar?
Answer: blue-collar