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Table. 1 Characteristics of the study cohort by surgery type

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 Decompression
Overall N = 3690 claims N = 5653
Mean (SD) age, years 43 (10) 43 (11)
Male, n (%) 2650 (71.8) 4353 (77)
Median (IQR) time to surgery, months 26 (10, 63) 9 (4, 25)
Mean (SD) follow-up time, years 3.5 (2.1) 3.2 (2.2)
Working prior to surgery, n/N (%)a 1036/3183 (32.5) 1796/4538 (39.6)
  1. SD standard deviation; IQR interquartile range
  2. a Work status measured in the 31-day period prior to surgery; pre-operative work status was available for 86.2 % (3183/3690) of the fusion cohort and 80.3 % (4538/5653) of the decompression cohort