The medicine will cost you X DKK every month (X = 100, 400, 700), and you will need to visit your GP for control Y times (Y = 2 times per month, 1 time per month, 4 times per year).
The intake of individual seafood items was grouped into four categories (none, 1-3 times per month, 1 time per week and 2 times per week or more).
Subjects were divided into three groups according to smoking status: non-smoking, past smoking and current smoking groups; and into four groups according to drinking status: non-drinking, 3 4 times per month, 1 2 times per week, 3 4 times per week and > 5 times per week.
The Cox proportional hazards model was used to control for such potential confounding factors as age at baseline (continuous), study area (nine PHC areas), smoking status (pack-years (0, 1 19, 20 29, 30 39, ⩾40)), green vegetable intake (⩽3 4 times per week, everyday), and leisure-time physical activity (⩽1 3 times per month, ⩾1 2 times per week).
The frequency of visiting friends was divided into five categories: every day, 1 2 times per week, 1 2 times per month, 3 6 times per year, and never.
The participants were asked how often they consume sugary drinks or sweets (seldom or never, several times per month, several times per week, every day, several times per day).
(Never; 1 6 times per year; 7 to 12 times per year, 2 to 4 times per month; several times per week; daily).
How often ambulance diversion is used (Never; 1 6 times per year; 7 to 12 times per year; 2 to 4 times per month; several times per week; daily). .
How often ambulance diversion is used (Never; 1 6 times per year; 7 to 12 times per year; 2 to 4 times per month; several times per week; daily).
We also created an ordinal variable with the categories: (1) Never, (2) 1–3 times per month; (3) 4 times per month or weekly; and (4) daily.
