Characteristics of individuals by decision to opt out of disease register analyses with significance levels for t-tests of differences in means and χ2 tests of differences in proportions.
| Opted out (n = 333) | Opted in (n = 4836) | P-value | |
|---|---|---|---|
| Mean age, years (SD) | 50.9 (20.2) | 47.9 (21.2) | <0.001 |
| Female, % (n) | 59.5 (194/326) | 54.9 (2595/4729) | 0.100 |
| Smokers, % (n) | 36.4 (91/250) | 37.6 (1402/3727 | 0.700 |
| Exposed to passive smoke at home, % (n) | 35.7 (85/238) | 38.5 (1440/3738) | 0.390 |
| Higher education, % (n) | 28.9 (95/329) | 37.7 (1801/4773) | 0.001 |
| Seeking work, % (n) | 3.8 (12/316) | 2.3 (103/4558) | 0.080 |
| EQ-5D problems, % (n): | |||
| Mobility | 29.7 (94/316) | 31.3 (1478/4722) | 0.560 |
| Self-care | 14.3 (45/314) | 12.5 (583/4658) | 0.350 |
| Usual activities | 31.8 (101/318) | 31.0 (1461/4717) | 0.770 |
| Pain/discomfort | 46.4 (148/319) | 47.5 (2231/4695) | 0.700 |
| Anxiety/depression | 42.4 (133/314) | 35.2 (1646/4671) | 0.010 |
| EQ-5Dindex, mean (SD) | 0.8 (0.3) | 0.8 (0.3) | 0.940 |
| EQ-5Dvas, mean (SD) | 73.8 (19.8) | 70.9 (19.8) | 0.010 |