Table 1 Study population by age, sex and area.
Age (years) | Sex | Area | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Study population | 16-25 | 26-35 | 36-45 | 46-55 | 56-65 | 66-76 | Men | Women | p-value | West Gothia | Gothenburg | p-value | Total | |
Initial study sample | N | 30000 | ||||||||||||
Not possible to trace | N (%) | 157 (2.3) | 165 (2.8) | 80 (1.4) | 49 (1.0) | 26 (0.5) | 12 (0.4) | 311 (2.0) | 178 (1.2) | < 0.001 | 175 (1.2) | 314 (2.1) | < 0.001 | 489 (1.6) |
Deceased | N (%) | 1 (0.02) | 1 (0.02) | 1 (0.02) | 3 (0.06) | 2 (0.04) | 9 (0.3) | 11 (0.07) | 6 (0.04) | 0.225 | 9 (0.1) | 8 (0.1) | < 0.001 | 17 (0.06) |
Moved | N (%) | 40 (0.7) | 24 (0.4) | 12 (0.2) | 3 (0.06) | 2 (0.04) | 6 (0.2) | 41 (0.3) | 46 (0.3) | 0.594 | 30 (0.2) | 57 (0.4) | 0.005 | 87 (0.3) |
Not able due to disease or disability | N (%) | 11 (0.2) | 11 (0.2) | 14 (0.2) | 18 (0.4) | 33 (0.7) | 34 (1.2) | 66 (0.4) | 55 (0.4) | 0.318 | 64 (0.4) | 57 (0.4) | 0.525 | 121 (0.4) |
Other causes | N (%) | 11 (0.2) | 14 (0.2) | 9 (0.2) | 13 (0.3) | 9 (0.2) | 12 (0.4) | 37 (0.3) | 31 (0.2) | 0.544 | 32 (0.2) | 36 (0.2) | 0.716 | 68 (0.2) |
Real study sample | N | 5242 | 5653 | 5593 | 4947 | 4941 | 2842 | 14534 | 14684 | 14691 | 14527 | 29218 | ||
Did not want to participate or returned a blank questionnaire | N (%) | 61 (1) | 50 (1) | 56 (1) | 62 (1) | 88 (2) | 82 (3) | 186 (1) | 213 (2) | 0.226 | 222 (2) | 177 (1) | 0.034 | 399 (1) |
Non-responders | N (%) | 2577 (49) | 2484 (44) | 2247 (40) | 1660 (34) | 1194 (24) | 570 (20) | 6158 (42) | 4574 (31) | < 0.001 | 5039 (34) | 5693 (39) | < 0.001 | 10732 (37) |
Responders | N (%) | 2604 (51) | 3119 (55) | 3290 (59) | 3225 (65) | 3659 (74) | 2190 (77) | 8190 (56) | 9897 (67) | < 0.001 | 9430 (64) | 8657 (60) | < 0.001 | 18087 (62) |