Table 1

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 (%)
Total8348 (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
 Compulsory1282 (16)223 (23)204 (19)143 (12)105 (7)236 (26)199 (21)102 (12)70 (8)
 Upper secondary3256 (40)430 (44)470 (44)496 (42)492 (34)389 (43)406 (43)329 (38)243 (29)
 Higher3708 (45)321 (33)405 (38)533 (46)863 (59)271 (30)343 (36)431 (50)541 (63)
Swedish born
 No1011 (12)184 (19)123 (11)117 (10)103 (7)161 (18)115 (12)107 (12)75 (9)
 Yes7294 (88)796 (81)959 (89)1055 (90)1361 (93)738 (82)830 (88)757 (88)778 (91)
Alcohol consumption
 No1101 (14)169 (18)118 (11)92 (8)77 (5)278 (32)183 (20)107 (13)64 (8)
 Low6076 (75)700 (74)851 (81)957 (83)1189 (82)509 (59)627 (69)615 (73)600 (72)
 Moderate734 (9)53 (6)57 (5)70 (6)133 (9)64 (7)87 (10)108 (13)160 (19)
 High188 (2)27 (3)28 (3)29 (3)47 (3)13 (2)17 (2)16 (2)11 (1)
SEI (Socio-economic classification)
 Unskilled manual workers1284 (16)241 (28)212 (21)192 (17)115 (8)238 (30)157 (17)89 (11)30 (4)
 Skilled manual workers641 (8)125 (14)118 (12)90 (8)48 (3)98 (13)73 (8)59 (7)23 (3)
 Lower non-manual workers1159 (15)90 (10)117 (12)122 (11)99 (7)164 (21)256 (28)184 (22)122 (15)
 Intermediate non-manual workers2075 (26)145 (17)238 (23)302 (26)401 (28)157 (20)262 (29)253 (31)307 (37)
 Higher non-manual workers2038 (26)133 (15)231 (23)343 (30)593 (42)80 (10)119 (13)217 (26)316 (38)
 Self-employed663 (8)144 (16)104 (10)93 (8)171 (12)48 (6)33 (4)28 (3)40 (5)
Psychological distress (12-item General Health Questionnaire)
 No7174 (88)837 (87)949 (89)1053 (91)1300 (90)736 (83)802 (86)733 (86)727 (86)
 Yes1015 (12)122 (13)113 (11)107 (9)151 (10)154 (17)127 (14)119 (14)115 (14)