Collection of questionnaire data for studies 1 and 2 and characterisation of non-respondent and respondent cases and referents with respect to age, sex and education level
| Study 1: ulnar neuropathy | Study 2: ulnar neuropathy-like symptoms | |||
|---|---|---|---|---|
| Cases | Referents | Cases | Referents | |
| Questionnaire, n | 546 | 1450* | 633 | 1667* |
| Non-respondents, n (%) | 222 (40.7) | 618 (42.6) | 237 (37.4) | 706 (42.4) |
| Age† (years), mean (SD) | 45.6 (10.3) | 45.7 (10.7) | 42.8 (10.1) | 43.3 (10.5) |
| Gender | ||||
| Male, n (%) | 153 (68.9) | 424 (68.6) | 101 (42.6) | 290 (41.1) |
| Female, n (%) | 69 (31.1) | 194 (31.4) | 136 (57.4) | 416 (58.9) |
| Education level, n (%) | ||||
| Higher or medium | 39 (17.6) | 145 (23.5) | 37 (15.6) | 153 (21.7) |
| Vocational | 71 (32.0) | 219 (35.4) | 75 (31.6) | 234 (33.1) |
| Low | 78 (35.1) | 132 (21.4) | 88 (37.1) | 190 (26.9) |
| Cash benefit | 17 (7.7) | 45 (7.3) | 20 (8.4) | 60 (8.5) |
| Missing | 17 (7.7) | 77 (12.5) | 17 (7.2) | 69 (9.8) |
| Respondents, n (%) | 324 (59.3) | 832 (57.4) | 396 (62.6) | 961 (57.6) |
| Age† (years), mean (SD) | 48.1 (10.4) | 49.1 (9.5) | 44.1 (10.7) | 45.1 (10.0) |
| Gender | ||||
| Male, n (%) | 203 (62.7) | 513 (61.7) | 132 (33.3) | 332 (34.5) |
| Female, n (%) | 121 (37.3) | 319 (38.3) | 264 (66.7) | 629 (65.5) |
| Education level, n (%) | ||||
| Higher or medium | 65 (20.1) | 232 (27.9) | 73 (18.4) | 300 (31.2) |
| Vocational | 107 (33.0) | 294 (35.3) | 149 (37.6) | 317 (33.0) |
| Low | 114 (35.2) | 155 (18.6) | 130 (32.8) | 197 (20.5) |
| Cash benefit | 17 (5.2) | 16 (1.9) | 19 (4.8) | 24 (2.5) |
| Missing | 21 (6.5) | 135 (16.2) | 25 (6.3) | 123 (12.8) |
| Numbers in informative match-groups (questionnaire information from case and at least one control) | 283 | 748 | 349 | 869 |
*The final number of referents who received the questionnaire was less than three per case because referents were drawn before the study population was finally updated in the Danish Civil Registration System with exclusion due to death, emigration, address in Greenland, name and/or address protection and protection against enquiries in connection with scientific studies.
†Age at index date.