All US adults
18-24
25-34
35-44
45-54
55+
Several times a day
22
16
23
24
24
21
Once a day
17
16
17
17
18
17
4 to 6 times a week
16
20
17
17
13
14
2 to 3 times a week
20
23
18
20
19
21
Once a week
18
18
16
16
19
21
Don't know
7
8
9
5
7
7