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Table 1 Participants’ baseline characteristics

From: The impact of work related physical activity and leisure physical activity on the risk and prognosis of neck pain – a population based cohort study on workers

  Cohort I (risk cohort), individuals with no neck pain at baseline (n = 4 681) Cohort II (prognostic cohort), individuals with occasional neck pain at baseline (n = 6 820)
Cases n (%) Non cases n (%) Cases n (%) Non cases n (%)
N 177 4 504 766 6 054
Male sex 93 (53) 2 701 (60) 299 (39) 2 584 (43)
Age, mean (SD) 42.82 (9.90) 43.80 (10.95) 42.26 (9.89) 41.85 (10.87)
Individual disposable income (SEKa)     
 0–115 299 48 (27) 745 (17) 214 (28) 1 253 (21)
 115 30–154 399 44 (25) 988 (22) 172 (23) 1 417 (24)
 154 200 – 207 499 43 (25) 1 227 (27) 199 (26) 1 658 (28)
  ≥ 207 500 40 (23) 1 519 (34) 172 (23) 1 686 (28)
Swedish born     
 No 42 (24) 472 (11) 199 (26) 823 (14)
 Yes 135 (76) 4 023 (89) 565 (74) 5 211 (86)
Smoking (%)     
 Never 92 (54) 2 146 (50) 328 (45) 2 709 (47)
 Ever 28 (16) 916 (21) 152 (21) 1 174 (21)
 Current 50 (29) 1 212 (28) 247 (34) 1 839 (32)
SEI b     
 Unskilled manual workers 29 (17) 598 (14) 141 (19) 915 (15)
 Skilled manual workers 17 (10) 318 (7) 94 (13) 584 (10)
 Lower non-manual workers 19 (11) 532 (12) 101 (14) 843 (14)
 Intermediate non-manual workers 47 (27) 1 196 (27) 193 (26) 1 690 (28)
 Higher non-manual workers 38 (22) 1 298 (29) 138 (19) 1 419 (24)
 Self-employed 22 (13) 489 (11) 79 (11) 515 (9)
Psychological distress (12-item General Health Questionnaire)     
 No 135 (79) 3 854 (87) 538 (71) 4 671 (78)
 Yes 35 (21) 569 (13) 221 (29) 1 345 (22)
Alcohol consumption (Expressed in grams of 100 % alcohol per day)     
 No 24 (14) 368 (8) 91 (12) 526 (9)
 Low 128 (75) 3 519 (79) 549 (74) 4 578 (77)
 Moderate 13 (8) 435 (10) 87 (12) 697 (12)
 High 5 (3) 113 (3) 15 (2) 130 (2)
Concurrent low back pain     
 No, never 91 (51) 2 677 (60) 164 (22) 1 564 (26)
 Yes, a couple of days the past 12 months 44 (25) 1 191 (27) 311 (41) 2 732 (45)
 Yes, a couple of days per month 22 (12) 360 (8) 211 (28) 1 324 (22)
 Yes, a couple of days per week 6 (3) 151 (3) 43 (6) 274 (5)
 Yes, daily 14 (8) 114 (3) 33 (4) 151 (3)
Do you have the freedom to decide how your work will be performed?     
 Never 9 (5) 146 (3) 50 (7) 268 (4)
 Mostly not 25 (14) 569 (13) 139 (18) 1 105 (18)
 Yes, most of the time 108 (62) 2 749 (62) 435 (58) 3 727 (62)
 Always 32 (18) 997 (22) 126 (17) 903 (15)
Do you have the freedom to decide what to perform at your work?     
 Never 18 (10) 302 (7) 87 (12) 541 (9)
 Mostly not 55 (32) 1 253 (28) 241 (32) 2 022 (34)
 Yes, most of the time 77 (44) 2 360 (53) 341 (45) 2 954 (49)
 Always 24 (14) 546 (12) 84 (11) 482 (8)
Do you have a stressful job?     
Somewhat, about 10 % of the time 63 (36) 1 854 (42) 279 (37) 2 068 (35)
 Yes, about 1/4 of the time 29 (17) 774 (18) 117 (16) 1 134 (19)
 Yes, half the time 27 (16) 656 (15) 134 (18) 1 018 (17)
 Yes, about 3/4 of the time 31 (18) 579 (13) 126 (17) 973 (16)
 Yes, almost the whole time 24 (14) 544 (12) 92 (12) 768 (13)
Do you work with your arms above shoulder level more than 30 min/day?     
 Almost never or never 128 (78) 3727 (85) 530 (71) 4673 (78)
 Yes, 1–3 days per month 5 (3) 166 (4) 40 (5) 290 (5)
 Yes, 1 day per week 2 (1) 102 (2) 25 (3) 178 (3)
 Yes, 2–4 days per week 6 (4) 119 (3) 48 (6) 256 (4)
 Yes, every day 23 (14) 280 (6) 99 (13) 562 (9)
Do you work with your arms below knee level more than 30 min/day?     
 Almost never or never 136 (82) 3784 (86) 566 (76) 4831 (81)
 Yes, 1–3 days per month 6 (4) 154 (4) 36 (5) 274 (5)
 Yes, 1 day per week 4 (2) 77 (2) 32 (4) 141 (2)
 Yes, 2–4 days per week 7 (4) 118 (3) 37 (5) 229 (4)
 Yes, every day 12 (7) 260 (6) 71 (10) 487 (8)
How big part of the day do you work in front of the computer?     
 Not at all 33 (20) 751 (17) 186 (25) 1205 (20)
 Maximum 1/10 33 (20) 825 (19) 123 (17) 1053 (18)
 About 1/4 28 (17) 718 (16) 91 (12) 813 (14)
 About 1/2 29 (18) 659 (15) 93 (13) 842 (14)
 About 3/4 11 (7) 635 (14) 96 (13) 828 (14)
 Almost the whole day 28 (17) 795 (18) 154 (21) 1217 (20)
  1. Presented per cohort among cases/non cases of long duration troublesome neck pain at follow-up
  2. aSwedish kroner
  3. bSocio-economic classification (Occupational class)
  4. The numbers may not add up to the total because of internal missing