Table 1.

Demographic data of the 367 included patients

Parameter	Mean ± SD	Range or percentage
Age (years)	64.6 ± 10.2	25–85
Sex (m:f)	162:205
Duration of surgery (min)	70.0 ± 23.5	31–195
ASA status	1  2	3  4
Frequency (%)	17.2   54.5	27.8  0.5
Chronic pain >3 months before surgery
In the operated region	271	73.8%
In the operated region and one other region	24	6.5%
NRS of chronic pain in the operated region	6.9 ± 1.7	1–10
NRS of chronic pain over all	6.9 ± 1.7	1–10

Abbreviations: ASA, American Society of Anaesthesiologists; SD, standard deviation; m, male; f, female; NRS, Numerical Rating Scale; min, minutes.