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Table 2 Sputum samples evaluation according to patient backgrounds

From: Validation of sputum Gram stain for treatment of community-acquired pneumonia and healthcare-associated pneumonia: a prospective observational study

  All patients Previous antibiotics Immunosuppressed Suspected aspiration
n = 670 n = 97 n = 40 n = 246
No sputum sample, n (%) 79 (11.8) 11 (11.3) 7 (17.5) 5 (2.0)
Poor quality sample, n (%) 113 (16.9) 20 (20.6) 9 (22.5) 54 (22.0)
Good quality sample, n (%) 478 (71.3) 66 (68.0) 24 (60.0) 187 (76.0)
  No meaningful microorganism, n (%) 57 (8.5) 24 (24.7) 2 (5.0) 25 (10.2)
  Polymicrobial flora, n (%) 150 (22.4) 16 (16.5) 4 (10.0) 83 (33.7)
  Predominant morphotype, n (%) 271 (40.4) 26 (26.8) 18 (45.0) 79 (32.1)
Positive predict, n (%) 189 (28.2) 13 (13.4) 9 (22.5) 51 (20.7)