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Table 5 Summary of the Oswestry Disability Index follow-up results

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

  Closed drainage group Non-drainage group p
Preoperative 59.9 ± 4.1 59.8 ± 4.2 0.736
Postoperative 32.4 ± 4.0 32.8 ± 3.9 0.348
Last follow-up 22.5 ± 3.1 22.8 ± 2.7 0.298
  1. Data are presented as mean ± standard deviation