Response options: Never or almost never, Some lessons, Many lessons, Every lesson or almost every lesson, Valid Skip, Not Applicable, Invalid, No Response
Response options: Never or almost never, Some lessons, Many lessons, Every lesson or almost every lesson, Valid Skip, Not Applicable, Invalid, No Response
Response options: BH: Missing; DE,SE:Inapplicable ; RU:Inappropriate response{, Not asked in survey, Not applicable, No answer, Don´t know, A great deal, Quite a lot, Not very much, None at all
