Response options: Never, Less than once a month, About once a month, Two or three times a month, About once a week, Several times a week, Once a day, More than once a day
Response options: Missing; RU,DE: Inappropriate response{Inappropriate}, Not asked in survey, Not applicable, No answer, Don´t know, Have done, Might do, Would never do
Response options: DE,MX,SE:Inapplicable ; RU:Inappropriate response; Missing{I, Not asked in survey, Not applicable, No answer, Don´t know, Have done, Might do, Would never do
