Demographic and clinical characteristics of patients.

<p>All values are medians with interquartile ranges unless mentioned otherwise. Percentages may not total 100 due to rounding.</p>†<p>Weak analgesics were defined as NSAIDS, paracetamol, codeine and tramadol. Strong analgesics were defined as opioid based therapies.</p>‡<p>Alcohol abusing patients were defined as female patients drinking >14 units of alcohol per week or male patients drinking >21 units of alcohol per week.</p><p>‘MEQ’ is morphine equivalents, ‘pregabalin’ is pregabalin study group and ‘placebo’ is placebo study group.</p><p>No statistical differences between groups were observed.