Table:
factor
%
95% confidence interval

from
to

reasons for use

get base tan
62.0
57.3
66.6

aesthetic
21.0
17.2
24.8

relax/feel better
15.8
12.4
19.2

boost immune system
8.9
5.9
12.0

treat skin condition
4.3
2.8
5.9

prevent cancer
f
f
f

other
6.6
4.2
9.1

frequency of use

periodic
73.4
69.2
77.6

regular
26.5
22.2
30.7

frequency of use in last month

1 to 10 sessions
69.9
60.7
79.1

11 to 31 sessions
24.9
16.0
33.8

not available/don't know/refusal/not stated
5.2
2.0
8.4

wore eye protection

yes
84.5
80.5
88.5

no
14.0
10.1
17.8

read warning labels each session in past year

yes
51.7
46.8
56.5

no
48.1
43.2
52.9

reasons for not reading warning labels

read in past
61.4
54.4
68.3

not important
16.2
9.7
22.8

did not notice labels
12.9
8.7
17.1

given oral instructions by attendant
7.2
3.8
10.6

no warning labels
f
f
f

didn't have time
f
f
f

unreadable
f
f
f

other
5.6
3.2
7.9

followed exposure schedule in past year

yes
80.2
75.8
84.7

no
18.4
14.0
22.8

reasons for not following exposure schedule

followed first time
23.8
11.0
36.6

no exposure schedule
22.3
12.1
32.6

given different exposure schedule by attendant
f
f
f

forgot
f
f
f

other
44.7
32.3
57.2

discomfort/injury to skin in past year

yes
10.4
7.5
13.2

no
89.6
86.7
92.5

number of episodes of discomfort/injury to skin in past year

1
56.3
41.4
71.3

2 to 12
41.7
26.8
56.7

not applicable/don't know/refused/not stated
f
f
f

number of days discomfort/injury lasted

2 or fewer
69.7
55.4
84

more than 2
28.1
13.6
42.6

not applicable/don't know/refused/not stated
f
f
f

In tables, merged cells are often found and we can denote them as JSON {'top-left':(X1, Y1), 'bottom-right':(X2, Y2)}, with '(X1, Y1)' and '(X2, Y2)' indicating the (row_id, column_id) of the top-left and bottom-right cells of the merged region. Please scan the table image provided, find all occurrences of merged cells, and return their coordinates in the stated format. It's important to remember that row and column IDs begin from 1.

The merged cell areas are as follows:
{'top-left':(1, 1), 'bottom-right':(3, 1)}
{'top-left':(1, 2), 'bottom-right':(3, 2)}
{'top-left':(1, 3), 'bottom-right':(2, 4)}
{'top-left':(4, 2), 'bottom-right':(4, 4)}
{'top-left':(12, 2), 'bottom-right':(12, 4)}
{'top-left':(15, 2), 'bottom-right':(15, 4)}
{'top-left':(19, 2), 'bottom-right':(19, 4)}
{'top-left':(22, 2), 'bottom-right':(22, 4)}
{'top-left':(25, 2), 'bottom-right':(25, 4)}
{'top-left':(34, 2), 'bottom-right':(34, 4)}
{'top-left':(37, 2), 'bottom-right':(37, 4)}
{'top-left':(43, 2), 'bottom-right':(43, 4)}
{'top-left':(46, 2), 'bottom-right':(46, 4)}
{'top-left':(50, 2), 'bottom-right':(50, 4)}.