Variable | Provision of data and definition |
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The variables markedahave been extracted from the SpineData database at The Spine Centre of Southern Denmark | |
Vitamin D level | Measured by blood sample: Serum 25-Hydroxyvitamin-D specified in nmol/L |
Results divided into 3 groups: (1) normal Vitamin D level > 50 nmol/L, (2) mild Vitamin D deficiency between 25–50 nmol/L, and (3) severe/moderate Vitamin D deficiency < 25 nmol/L [14] | |
Levels were measured in March, April and May 2011 | |
Body mass index, BMI a | Calculated from self-reported height (h) and weight from the database. |
Formula: BMI = mass (kg)/height2 (m) | |
Low Back Pain, LBP a | Pain intensity, (0–10 numerical rating scales). Self-reported from the database. |
Patients were asked to enter: (1) back pain now, (2) worst back pain last two weeks and (3) average back pain last two weeks. | |
LBP intensity is an average of the three entered scores [25] | |
Leg paina | Pain intensity, (0–10 numerical rating scales). Self-reported from the database. |
Patients were asked to enter: (1) leg pain now, (2) worst leg pain last two weeks and (3) average leg pain last two weeks. | |
 | Leg pain intensity is an average of the three entered scores [25]. |
Modic changes | Defined as signal changes in the vertebral end plates diagnosed on MRI [26] (Jensen, 2007). Data obtained from MRI descriptions. |
Modic changes were divided into groups: (1) No modic, (2) Modic Type 1, (3) | |
Modic Type 2 and (4) Modic Types 1 and 2 | |
Weakness in legs a | Patients were asked about any weakness in the legs. Self-reported from the database (yes/no) |
Paresthesia in legs a | Patients were asked about any paresthesia in the legs. Self -reported from the database (yes/no) |
Widespread pain a | Patients reported their pain on a pain chart. In the database, the chart is divided into 46 different pain sites, which enables the database to calculate the number of pain regions |