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Table 2 Patient and clinical characteristics in relation to bacterial positivity

From: Latent infection of low-virulence anaerobic bacteria in degenerated lumbar intervertebral discs

Parameters n = 77* Positive culture n = 23* Negative culture n = 54 P
Age 50.9 ± 12.1 44.7 ± 11.5 53.5 ± 11.5 0.003
Male 35 13 22 0.203
Female 42 10 32  
Diabetes 12 3 9 0.979
Smoker 26 6 20 0.352
VAS for back 4.2 ± 1.8 4.0 ± 1.7 4.2 ± 1.8 0.616
VAS for leg 5.1 ± 1.6 5.1 ± 1.5 5.1 ± 1.7 0.989
Level of disc culture
L3/4 10 4 6 0.250
L4/5 40 14 26  
L5/S1 27 5 22  
  1. *Three cases of suspicious contamination were excluded