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Table 1 Demographic and clinical characteristics of the patients

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

  Closed drainage group
(n = 214)
Non-drainage group
(n = 206)
p
Age (yr.) 50.4 ± 6.6 49.6 ± 6.2 0.220
Male to female ratio 122:92 129:77
Operation time (min.) 60.6 ± 4.1 60.2 ± 3.9 0.359
Intraoperative blood loss (ml.) 62.7 ± 6.5 62.6 ± 6.2 0.856
Hemorrhagic collection (ml.) 54.2 ± 15.5
  1. Data are presented as mean ± standard deviation