eTable. Summary of the outpatient surgical procedures most commonly performed on patients of the cohort.

OPS code	OPS definition	Number of patients
5–895.2a	Radical and extensive excision of diseased tissue on the skin and subcutaneous tissue, with primary wound closure: chest wall and back	2629
5–812.5	Arthroscopic surgery on the articular cartilage and on the menisci: partial meniscus resection	1790
5–895.24	Radical and extensive excision of diseased tissue on the skin and subcutaneous tissue, with primary wound closure: other parts of the head	1761
5–690.0	Therapeutic curettage (abrasio uteri): without application of local medication	1450
5–215.3	Operations on the lower nasal concha: submucosal resection	1363
5–056.40	Neurolysis and decompression of a nerve, nerve hand: open surgical	1141
5–385.70	Ligation, excision, and stripping of varices, crossectomy and stripping: great saphenous vein	1140
5–214.6	Submucosal resection and plastic reconstruction of the nasal septum: plastic correction with resection	560
5–895.2e	Radical and extensive excision of diseased tissue on the skin and subcutaneous tissue, with primary wound closure: thighs and knees	526
5–895.2g	Radical and extensive excision of diseased tissue on the skin and subcutaneous tissue, with primary wound closure: foot	493
5–895.2b	Radical and extensive excision of diseased tissue on the skin and subcutaneous tissue, with primary wound closure: abdominal region	493
5–895.3a	Radical and extensive excision of diseased tissue on the skin and subcutaneous tissue, with primary wound closure, histographically controlled (micrographic surgery): chest wall and back	461
5–493.2	Surgical treatment of hemorrhoids: excision (e.g., according to Milligan-Morgan)	432

OPS, German Operations and Procedures Classification