Table 1

Characteristics of 67 855 lumbar spine operations in 57 081 patients in Norway, 1999–2013

No. of operations (%)Length of stay, days, median (range, IQR)
Age (years)
 18-3916396 (24.2)4.2 (724, 4.4)
 40-5928237 (41.7)6.3 (618, 4.7)
 60-7516160 (23.9)5.9 (250, 5.8)
 > 756910 (10.2)7.2 (226, 6.7)
 Missing152
Gender
 Male34902 (51.4)4.7 (239, 4.4)
 Female32801 (48.3)6.0 (724, 5.8)
 Missing152
Year of operation
 19993460 (5.1)7.1 (149.9, 6.0)
 20003996 (5.9)7.0 (420, 6.0)
 20014200 (6.2)7.0 (138, 6.0)
 20023865 (5.7)6.2 (202, 6.0)
 20034557 (6.7)6.1 (238, 5.4)
 20044396 (6.5)6.1 (250, 5.8)
 20054572 (6.7)6.0 (724, 5.3)
 20064422 (6.5)5.8 (138, 5.5)
 20074255 (6.3)5.1 (618, 5.0)
 20084164 (6.1)4.9 (179, 4.3)
 20094449 (6.6)4.2 (142, 4.9)
 20105130 (7.6)4.1 (183, 4.8)
 20115241 (7.7)4.0 (210, 4.2)
 20125597 (8.2)4.1 (165, 4.2)
 20135551 (8.2)3.8 (219, 4.1)
 Missing00
Type of surgery
 Simple56764 (83.7)4.3 (724, 4.3)
 Complex11091 (16.3)8.2 (420, 5.7)
No. of operations
 157029 (84.0)5.1 (724, 5.0)
 28623 (12.7)5.2 (618, 5.1)
 31602 (2.4)6.2 (205, 6.0)
 ≥ 4467 (0.7)6.9 (115, 4.4)
 Missing134134