Table 2. Demographic data (as n (%)).

	Women (n = 403)	Men (n = 487)	p Value
Age (years)
<50 years	176(39.6%)	269(60.4%)	<0.001
≥50 years	226(50.9%)	218(49.1%)
Preoperative chronic pain
Patients with preoperative chronic pain	275 (52.0%)	254 (48.0%)	<0.001
Patients without preoperative chronic pain	122(34.8%)	229(65.2%)
Surgical procedure
Bone surgery	154 (46.7%)	176 (53.3%)	0.214
Joint surgery	189 (46.6%)	217 (53.4%)
Soft tissue surgery	59 (38.8%)	93 (61.2%)
Anesthetic technique
General anesthesia	274 (44.9%)	336 (55.1%)	0.248
Regional anesthesia	34 (39.5%)	52 (60.5%)
General and regional anesthesia	90 (50.0%)	90 (50.0%)

Sex related differences were compared with χ² Test.