Baseline characteristics in cohort I (no neck pain at baseline) per sex and income quartile (expressed in SEK)
| All (n=8348) | Men (n=4745) | Women (n=3603) | |||||||
| 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 (%) | |
| Total | 8348 (100) | 986 (12) | 1088 (13) | 1176 (14) | 1468 (18) | 913 (11) | 950 (11) | 865 (10) | 856 (10) |
| Age, mean (SD) | 51 (17) | 47 (18) | 52 (17) | 52 (15) | 51 (14) | 49 (20) | 52 (18) | 50 (15) | 52 (14) |
| Education | |||||||||
| Compulsory | 1282 (16) | 223 (23) | 204 (19) | 143 (12) | 105 (7) | 236 (26) | 199 (21) | 102 (12) | 70 (8) |
| Upper secondary | 3256 (40) | 430 (44) | 470 (44) | 496 (42) | 492 (34) | 389 (43) | 406 (43) | 329 (38) | 243 (29) |
| Higher | 3708 (45) | 321 (33) | 405 (38) | 533 (46) | 863 (59) | 271 (30) | 343 (36) | 431 (50) | 541 (63) |
| Swedish born | |||||||||
| No | 1011 (12) | 184 (19) | 123 (11) | 117 (10) | 103 (7) | 161 (18) | 115 (12) | 107 (12) | 75 (9) |
| Yes | 7294 (88) | 796 (81) | 959 (89) | 1055 (90) | 1361 (93) | 738 (82) | 830 (88) | 757 (88) | 778 (91) |
| Alcohol consumption | |||||||||
| No | 1101 (14) | 169 (18) | 118 (11) | 92 (8) | 77 (5) | 278 (32) | 183 (20) | 107 (13) | 64 (8) |
| Low | 6076 (75) | 700 (74) | 851 (81) | 957 (83) | 1189 (82) | 509 (59) | 627 (69) | 615 (73) | 600 (72) |
| Moderate | 734 (9) | 53 (6) | 57 (5) | 70 (6) | 133 (9) | 64 (7) | 87 (10) | 108 (13) | 160 (19) |
| High | 188 (2) | 27 (3) | 28 (3) | 29 (3) | 47 (3) | 13 (2) | 17 (2) | 16 (2) | 11 (1) |
| SEI (Socio-economic classification) | |||||||||
| Unskilled manual workers | 1284 (16) | 241 (28) | 212 (21) | 192 (17) | 115 (8) | 238 (30) | 157 (17) | 89 (11) | 30 (4) |
| Skilled manual workers | 641 (8) | 125 (14) | 118 (12) | 90 (8) | 48 (3) | 98 (13) | 73 (8) | 59 (7) | 23 (3) |
| Lower non-manual workers | 1159 (15) | 90 (10) | 117 (12) | 122 (11) | 99 (7) | 164 (21) | 256 (28) | 184 (22) | 122 (15) |
| Intermediate non-manual workers | 2075 (26) | 145 (17) | 238 (23) | 302 (26) | 401 (28) | 157 (20) | 262 (29) | 253 (31) | 307 (37) |
| Higher non-manual workers | 2038 (26) | 133 (15) | 231 (23) | 343 (30) | 593 (42) | 80 (10) | 119 (13) | 217 (26) | 316 (38) |
| Self-employed | 663 (8) | 144 (16) | 104 (10) | 93 (8) | 171 (12) | 48 (6) | 33 (4) | 28 (3) | 40 (5) |
| Psychological distress (12-item General Health Questionnaire) | |||||||||
| No | 7174 (88) | 837 (87) | 949 (89) | 1053 (91) | 1300 (90) | 736 (83) | 802 (86) | 733 (86) | 727 (86) |
| Yes | 1015 (12) | 122 (13) | 113 (11) | 107 (9) | 151 (10) | 154 (17) | 127 (14) | 119 (14) | 115 (14) |