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Ived and modified variables A categorical variable corresponding to subject’s variety of comorbidities self-reported to be severely affecting their overall health was derived applying baseline data. Age was categorized into the get BCTC following age groups: 183, 249, 309, 409 and 50 years. The cut-points have been chosen to distribute subjects roughly equally across the age groups, and happen to be applied in prior studies utilizing this cohort.2.three. Statistical analysisThe baseline qualities of the cohort have been described using medians with interquartile ranges (IQR) and frequencies with proportions ( ). Medians had been used rather of signifies since continuous variables had skewed distributions. The annual general, age- and sex-specific incidence rates of MBP per one hundred,000 population had been calculated1488 Eur J Pain 19 (2015) 1486–2015 The Authors. European Journal of Discomfort 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.Mid-back pain just after traffic collisionsTable 1 Baseline traits presented as frequencies with percentages or medians with interquartile ranges of 3711 Saskatchewan (Canada) residents with mid-back discomfort just after website traffic collisions occurring in 1997999. Baseline characteristics n ( )Median (IQR) Missing values 0Table 1 (Continued) Baseline traits 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 (19.2) 50 746 (20.1) Median age (years) 35.7 (25.37.two) Marital status Single 1279 (34.five) Married 1934 (52.1) Widowed 104 (2.8) Separated 392 (10.six) Education level Higher college graduate or reduced 1713 (46.three) A lot more than high school graduate 1988 (53.7) Annual family household earnings (CAD) 20,000 1211 (33.6) 20,000 to 40,000 1127 (31.three) 40,000 to 60,000 708 (19.7) 60,000 554 (15.four) Variety of dependents two 3267 (88.1) 3 443 (11.9) Discomfort location and median discomfort intensity score (NRS-11) Head 3001 (81.0) Head discomfort intensity six (six) Neck 3545 (95.three) Neck discomfort intensity 7 (five) Low back 2846 (76.8) Low back discomfort intensity six (two) Mid back 3711 Mid-back pain intensity six (5) Arm 1824 (49.2) Arm discomfort intensity 0 (0) Hand 936 (25.2) Hand discomfort intensity 0 (0) Well being now in comparison with 1 year ago 1514 (40.9) Somewhat or much superior, or regarding the very same Somewhat or a great deal worse 2192 (59.two) Quantity of severely affecting comorbiditiesa, variety 0 0 2394 (64.9) 1 801 (21.7) 2 300 (8.1) 3 196 (5.three) Depressive symptoms Median CES-D score 16 (7.46.three) Expectations for recovery Get much better soon 736 (19.9) Get far better gradually 1583 (42.7) In no way get better 88 (2.four) Do not know 1300 (35.1)Other symptoms knowledgeable right after the collision Pain when moving neck 3085 (83.1) Sleeping complications 2645 (71.3) Reduced capability to move neck 2611 (70.4) Uncommon fatigue or tiredness 1993 (53.7) Anxiousness 1796 (48.four) Vertigodizziness 1754 (47.3) Irritability 1589 (42.eight) Arm numbness 1584 (42.7) Concentrationattention troubles 1057 (28.five) Leg numbness 1029 (27.7) Sore jaw 763 (20.6) Memory problems 666 (18.0) Post-crash amnesia, straight away right after collision No 3130 (84.three) Yes 270 (7.three) Do not know 311 (eight.four) Prior injury claim (MVC); SGI No 2411 (69.1) Yes 1077 (30.9) Preceding injury claim (non-MVC); other insurancedisability program No 2717 (77.83) Yes 774 (22.2)4 38 0 44 four 43 0 69 3 25 1 22n, the quantity corresponding towards the characteristic; IQR, interquartile range; CAD, Canadian dollar; NRS-11 is numerical rating scale, CES-D, Centre for Epidemiological Research Depression Scale; MVC.

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