control
-3
|
not Applicable
de
|
| -2
|
don't know/invalid
de
|
| -1
|
refuse
de
|
| 1
|
Not at all
de
|
| 2
|
Several days
de
|
| 3
|
More than half of the days
de
|
| 4
|
Nearly everyday
de
|
