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Table. 2 Characteristics of the study cohort by surgery type and spine region

From: Rates, costs, return to work and reoperation following spinal surgery in a workers’ compensation cohort in New South Wales, 2010–2018: a cohort study using administrative data

  Fusion N = 2298 Decompression N = 3495
Cervical N = 701  N = 416
  Mean (SD) age, years 45 (8.8) 45.7 (9.3)
  Male, n (%) 476 (67.9) 333 (80)
  Median (IQR) time to surgery, months 14.7 (5.8, 35.5) 10.2 (4.6, 25.4)
  Mean (SD) follow-up time, years 3.3 (2.1) 3.2 (2.2)
  Working prior to surgery, n/N (%)* 233/581 (40.1) 153/323 (47.3)
Lumbar N = 1597  N = 3079
  Mean (SD) age, years 41.2 (10.3) 41.6 (11.4)
  Male, n (%) 1176 (73.6) 2400 (77.9)
  Median (IQR) time to surgery, months 32.3 (14.2, 82.3) 7.8 (4, 21.8)
  Working prior to surgery, n/N (%)a 435/1412 (30.8) 985/2473 (39.8)
  1. SD standard deviation; IQR interquartile range
  2. aWork status measured in the 31-day period prior to surgery; pre-operative work status was available for 81 % of the cohort with spine region available