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Table 2 Summary of the primary clinical results

From: Closed drainage versus non-drainage for single-level lumbar discectomy: a prospective randomized controlled study

  Closed drainage group Non-drainage group p
Fever 40 58 0.022a
  < 38.5 °C 38 55 0.027a
  ≥ 38.5 °C 2 3 0.308b
SEH 0 1 0.491b
Infection 0 0
Revision surgery 1 1 0.501b
  1. Abbreviation: SEH symptomatic epidural hematomas
  2. achi square test
  3. bFisher exact test