Table 5.

Incidence of persistent pain at 1, 3 and 6 months

	Breast surgery (n = 655)	Sternotomy (n = 1183)	Endometriosis (n = 862)	TKA (n = 597)	Total population (n = 3297)
CPSP at 1 month
- Missing data	175	289	173	121	758
- No	430 (89.6)	773 (86.5)	580 (84.2)	328 (68.9)	2111 (83.1)
- Yes	50 (10.4)	121 (13.5)	109 (15.8)	148 (31.1)	428 (16.9)
CPSP at 3 months
- Missing data	200	281	225	137	843
- No	412 (90.5)	835 (92.6)	555 (87.1)	393 (85.4)	2195 (89.4)
- Yes	43 (9.5)	67 (7.4)	82 (12.9)	67 (14.6)	259 (10.6)
CPSP at 6 months
- Missing data	194	317	251	140	902
- No	427 (92.6)	806 (93.1)	512 (83.8)	398 (87.1)	2143 (89.5)
- Yes	34 (7.4)	60 (6.9)	99 (16.2)	59 (12.9)	252 (10.5)

Value are presented as number and number (%).

CPSP, chronic postsurgical pain; TKA, total knee arthroplasty.

The small differences between Tables 5 and 6 in the total numbers of patients with CPSP is due to missing DN4 questionnaire responses.