Sociodemographic characteristics of the respondents and non-respondents
| Respondents | Non-respondents | Source of information | |
| (n=2496) | (n=1971) | ||
| Gender, women, % | 35.3 | 42.8 | CRS |
| Age (at diagnosis), mean years (25th/75th percentile) | 68.7 (62.1/76.4) | 69.3 (59.0/80.6) | CRS |
| Diagnosis, % | NPR | ||
| Ischaemic heart disease | 43.4 | 41.3 | |
| Atrial fibrillation | 30.3 | 36.1 | |
| Heart failure | 10.6 | 15.2 | |
| Heart valve disease | 15.7 | 7.5 | |
| Civil status, % | CRS | ||
| Married | 64.2 | 48.1 | |
| Widow/widower | 16.3 | 23.5 | |
| Divorced | 12.0 | 16.7 | |
| Unmarried | 7.5 | 11.7 | |
| Educational level, % | PER | ||
| Basic school | 36.2 | 47.1 | |
| Upper secondary or vocational school | 41.9 | 37.1 | |
| Higher education | 21.9 | 15.9 | |
| Income, EUR, mean (25th/75th percentile) | 27,596 (17,597/32,493) | 24,744 (16.389/27,763) | ISR |
| Ethnic background, % | CRS | ||
| Danish origin | 94.7 | 91.8 | |
| Immigrant | 5.1 | 7.9 | |
| Descendant | 0.2 | 0.3 | |
| Region, % | CRS | ||
| Capital Region of Denmark | 25.2 | 31.4 | |
| Central Denmark Region | 22.8 | 20.4 | |
| North Denmark Region | 10.5 | 10.0 | |
| Region of Southern Denmark | 24.0 | 23.5 | |
| Region Zealand | 17.5 | 14.8 | |
| Time from diagnosis to distribution of questionnaires, Months*, mean (25th/75th percentile) | 16.3 (13.1/19.6) | 16.5 (13.3/19.8) | NPR |
*Standard month=30 days.
CRS, The Danish Civil Registration System; ISR, The Income Statistics Register; NPR, The Danish National Patient Register; PER, The Population’s Education Register.27