Table 1.
Characteristics of the study population
| Total, n = 2007 n (%) |
Male, n = 1007 n (%) |
Female, n = 1000 n (%) |
P value | |
|---|---|---|---|---|
| Age (years) | 0.017 | |||
| 30–44 | 725 (36) | 338 (34) | 387 (39) | |
| 45–59 | 1282 (64) | 669 (66) | 613 (61) | |
| Ethnicity | 0.192 | |||
| Norwegian | 1593 (79) | 800 (79) | 793 (79) | |
| Other | 186 (9) | 102 (10) | 84 (8) | |
| Missing | 228 (11) | 123 (12) | 105 (11) | |
| Educational level | < 0.001 | |||
| Primary school (7–10 years) | 93 (5) | 46 (5) | 47 (5) | |
| High school (general) | 181 (9) | 86 (9) | 95 (10) | |
| High school (vocational) | 295 (15) | 163 (16) | 132 (13) | |
| Technical | 178 (9) | 114 (11) | 64 (6) | |
| University/college (minimum 4 years) | 1260 (63) | 598 (59) | 662 (66) | |
| Household income (Norwegian kroner) | < 0.001 | |||
| < 200,000–400,000 | 125 (7) | 44 (5) | 81 (9) | |
| 400,000–800,000 | 515 (28) | 246 (27) | 269 (29) | |
| 800,000–1,200,000 | 697 (38) | 364 (40) | 333 (36) | |
| More than 1,200,000 | 388 (21) | 218 (24) | 170 (19) | |
| Missing | 113 (6) | 45 (5) | 68 (7) | |
| Area of residency | 0.508 | |||
| Capital area Oslo/Akershus | 442 (22) | 222 (22) | 220 (22) | |
| Eastern Norway | 767 (38) | 384 (38) | 384 (38) | |
| Southern and Western Norway | 301 (15) | 162 (16) | 139 (14) | |
| Central and Northern Norway | 497 (25) | 240 (24) | 257 (26) | |
| Occupation | < 0.001 | |||
| Full time work | 1595 (80) | 882 (88) | 713 (71) | |
| Part time work | 201 (10) | 39 (4) | 162 (16) | |
| Social insurance | 167 (8) | 66 (7) | 101 (10) | |
| Othera | 44 (2) | 20 (2) | 24 (2) | |
aOther = at home, student, retired