Ived and modified variables A categorical variable corresponding to subject’s number of comorbidities self-reported to be severely affecting their well being was derived applying baseline data. Age was categorized in to the following age groups: 183, 249, 309, 409 and 50 years. The cut-points have been selected to distribute subjects roughly equally across the age groups, and have already been made use of in preceding studies using this cohort.two.3. Statistical analysisThe baseline traits in the cohort were described making use of medians with interquartile ranges (IQR) and frequencies with proportions ( ). Medians have been used as an alternative of indicates since continuous variables had skewed distributions. The annual all round, age- and sex-specific incidence prices of MBP per 100,000 population had been calculated1488 Eur J Pain 19 (2015) 1486–2015 The Authors. European Journal of Pain published PubMed ID:http://www.ncbi.nlm.nih.gov/pubmed/21346730 by John Wiley Sons Ltd on behalf of European Discomfort Federation – EFICM.S. Johansson et al.get JNJ-63533054 Mid-back discomfort right after traffic collisionsTable 1 Baseline characteristics presented as frequencies with percentages or medians with interquartile ranges of 3711 Saskatchewan (Canada) residents with mid-back pain following visitors collisions occurring in 1997999. Baseline qualities n ( )Median (IQR) Missing values 0Table 1 (Continued) Baseline qualities n ( )Median (IQR) Missing valuesWomen 2484 (66.9) Age group (years) 183 790 (21.3) 249 567 (15.three) 309 894 (24.1) 409 714 (19.two) 50 746 (20.1) Median age (years) 35.7 (25.37.two) Marital status Single 1279 (34.5) Married 1934 (52.1) Widowed 104 (2.8) Separated 392 
(10.six) Education level Higher college graduate or reduce 1713 (46.3) Much more than higher school graduate 1988 (53.7) Annual family household earnings (CAD) 20,000 1211 (33.6) 20,000 to 40,000 1127 (31.3) 40,000 to 60,000 708 (19.7) 60,000 554 (15.4) Variety of dependents two 3267 (88.1) 3 443 (11.9) Discomfort place and median pain intensity score (NRS-11) Head 3001 (81.0) Head discomfort intensity 6 (six) Neck 3545 (95.3) Neck discomfort intensity 7 (5) Low back 2846 (76.8) Low back pain intensity six (2) Mid back 3711 Mid-back discomfort intensity 6 (five) Arm 1824 (49.two) Arm discomfort intensity 0 (0) Hand 936 (25.two) Hand pain intensity 0 (0) Well being now in comparison with 1 year ago 1514 (40.9) Somewhat or considerably superior, or about the same Somewhat or substantially worse 2192 (59.two) Quantity of severely affecting comorbiditiesa, range 0 0 2394 (64.9) 1 801 (21.7) two 300 (8.1) three 196 (5.3) Depressive symptoms Median CES-D score 16 (7.46.3) Expectations for recovery Get much better soon 736 (19.9) Get better slowly 1583 (42.7) By no means get superior 88 (2.4) Don’t know 1300 (35.1)Other symptoms skilled right after the collision Pain when moving neck 3085 (83.1) Sleeping challenges 2645 (71.3) Lowered capability to move neck 2611 (70.4) Unusual fatigue or tiredness 1993 (53.7) Anxiousness 1796 (48.4) Vertigodizziness 1754 (47.3) Irritability 1589 (42.eight) Arm numbness 1584 (42.7) Concentrationattention challenges 1057 (28.5) Leg numbness 1029 (27.7) Sore jaw 763 (20.6) Memory problems 666 (18.0) Post-crash amnesia, immediately soon after collision No 3130 (84.three) Yes 270 (7.3) Don’t know 311 (eight.four) Previous injury claim (MVC); SGI No 2411 (69.1) Yes 1077 (30.9) Prior injury claim (non-MVC); other insurancedisability strategy No 2717 (77.83) Yes 774 (22.2)4 38 0 44 4 43 0 69 three 25 1 22n, the quantity corresponding for the characteristic; IQR, interquartile variety; CAD, Canadian dollar; NRS-11 is numerical rating scale, CES-D, Centre for Epidemiological Research Depression Scale; MVC.
