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Table 1 The characteristics of the study population

From: Reoperations after fusion surgeries for degenerative spinal diseases depending on cervical and lumbar regions: a national database study

Number (%) All patients Cervical fusion Lumbar fusion P
42,060 11,784 (28.02%) 30,276 (71.98%)
Age (years)      < 0.0001
 20–29 514 (1.22%) 206 (1.75%) 308 (1.02%)  
 30–39 1,933 (4.60%) 1,092 (9.27%) 841 (2.78%)  
 40–49 5,905 (14.04%) 3,455 (29.32%) 2,450 (8.09%)  
 50–59 11,770 (27.98%) 4,032 (34.22%) 7,738 (25.56%)  
 60–69 12,247 (29.12%) 1,928 (16.36%) 10,319 (34.08%)  
  ≥ 70 9,691 (23.04%) 1,071 (9.09%) 8,620 (28.47%)  
Mean age (SD) 59.47 ± 11.93 52.74 ± 11.36 62.09 ± 11.08 0.0012
Gender, female, n 23,587 (56.08%) 4,318 (36.64%) 19,269 (63.64%)  < 0.0001
Diabetes, n 16,610 (39.49%) 4,067 (34.51%) 12,543 (41.43%)  < 0.0001
Associated comorbidities, n 20,268 (48.19%) 4,937 (41.90%) 15,331 (50.64%)  < 0.0001
Hospital types
 Tertiary-referral hospital 11,179 (25.58%) 3,711 (31.49%) 7,468 (24.67%)  < 0.0001
 General hospital 12,507 (29.74%) 3,142 (26.66%) 9,365 (30.93%)  
 Hospital 17,956 (42.69%) 4,842 (41.09%) 13,114 (43.31%)  
 Clinic 418 (0.99%) 89 (0.76%) 329 (1.09%)  
Surgical approaches      < 0.0001
 Anterior 11,698 (27.81%) 11,040 (93.69%) 658 (2.17%)  
 Posterior 30,362 (72.19%) 744 (6.31%) 29,618 (97.83%)