Baseline characteristics in cohort II (occasional neck pain at baseline) per sex and income quartile (expressed in SEK)
| Total (n=10 523) | Men (n=4244) | Women (n=6279) | |||||||
| n (%) | 0–115 299, n (%) | 115 300–154 199, n (%) | 154 200–207 499, n (%) | ≥207 500, n (%) | 0–115 299, n (%) | 115 300–154 199, n (%) | 154 200–207 499, n (%) | ≥207 500, n (%) | |
| All | 10 523 (100) | 1024 (10) | 1008 (10) | 1067 (10) | 1116 (11) | 1796 (17) | 1605 (15) | 1510 (14) | 1336 (13) |
| Age, mean (SD) | 46 (16) | 44 (17) | 47 (16) | 47 (15) | 48 (14) | 42 (17) | 46 (17) | 46 (15) | 48 (13) |
| Education | |||||||||
| Compulsory | 1506 (15) | 227 (23) | 185 (19) | 157 (15) | 89 (8) | 330 (19) | 249 (16) | 179 (12) | 90 (7) |
| Upper secondary | 4558 (44) | 488 (49) | 499 (50) | 518 (49) | 404 (36) | 828 (47) | 767 (48) | 653 (43) | 401 (30) |
| Higher | 4344 (42) | 292 (29) | 314 (32) | 390 (37) | 620 (56) | 622 (35) | 586 (37) | 676 (45) | 843 (63) |
| Swedish born | |||||||||
| No | 1706 (16) | 271 (27) | 157 (16) | 125 (12) | 131 (12) | 427 (24) | 242 (15) | 178 (12) | 140 (11) |
| Yes | 8754 (84) | 749 (73) | 845 (84) | 937 (88) | 981 (88) | 1350 (76) | 1353 (85) | 1325 (88) | 1188 (90) |
| Alcohol consumption | |||||||||
| No | 1321 (13) | 155 (16) | 95 (10) | 73 (7) | 59 (5) | 435 (25) | 256 (17) | 158 (11) | 77 (6) |
| Low | 7499 (74) | 711 (73) | 774 (79) | 855 (83) | 905 (83) | 1100 (64) | 1078 (70) | 1088 (74) | 956 (73) |
| Moderate | 1133 (11) | 68 (7) | 76 (8) | 73 (7) | 94 (9) | 157 (9) | 199 (13) | 205 (14) | 255 (19) |
| High | 233 (2) | 38 (4) | 30 (3) | 36 (4) | 34 (3) | 21 (1) | 18 (1) | 26 (2) | 28 (2) |
| SEI (Socio-economic classification) | |||||||||
| Unskilled manual workers | 1869 (19) | 270 (29) | 254 (26) | 206 (20) | 93 (9) | 462 (29) | 308 (20) | 191 (13) | 68 (5) |
| Skilled manual workers | 1095 (11) | 150 (16) | 133 (14) | 131 (13) | 55 (5) | 278 (17) | 194 (13) | 114 (8) | 31 (2) |
| Lower non-manual workers | 1585 (16) | 97 (11) | 118 (12) | 113 (11) | 86 (8) | 300 (19) | 342 (22) | 321 (22) | 200 (15) |
| Intermediate non-manual workers | 2689 (27) | 150 (16) | 222 (23) | 258 (25) | 322 (29) | 331 (20) | 434 (28) | 496 (34) | 460 (35) |
| Higher non-manual workers | 2071 (21) | 99 (11) | 157 (16) | 249 (24) | 445 (41) | 141 (9) | 190 (12) | 292 (20) | 492 (38) |
| Self-employed | 682 (7) | 155 (17) | 82 (9) | 80 (8) | 93 (9) | 107 (7) | 61 (4) | 50 (3) | 52 (4) |
| Psychological distress (12-item General Health Questionnaire) | |||||||||
| No | 8038 (77) | 776 (77) | 800 (80) | 877 (83) | 913 (82) | 1250 (70) | 1194 (75) | 1158 (77) | 1029 (78) |
| Yes | 2411 (23) | 236 (23) | 201 (20) | 182 (17) | 200 (18) | 531 (30) | 401 (25) | 341 (23) | 299 (23) |