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Table 1 White blood cell counts and pulmonary variables in non-ventilated old and non-ventilated young rats (n = 4/group).

From: Susceptibility to ventilator induced lung injury is increased in senescent rats

  Old rats Young rats P
TWBC (/μl) 4,800 ± 524 9,037 ± 638 0.02
_PMN in blood (/μl) 867 ± 146 1,162 ± 65 Ns
_Macrophages in BAL (/μl) 11,744 ± 2,172 10,882 ± 2,646 Ns
_Protein in BAL (mg/l) 69 ± 35 97 ± 30 Ns
_Lung wet/dry weight ratio 4.68 ± 0.09 4.65 ± 0.06 Ns
_PaO2 at FiO2 1.0 (mmHg) 270 ± 60 446 ± 10 0.029
_PMN in BAL (/μl) Not detectable in 3; low counts in 1 animal Not detectable n.a.
  1. Values are mean ± SEM.
  2. BAL, bronchoalveolar lavage; FiO2, fraction of inspired oxygen; n.a., not applicable; PaO2, arterial oxygen tension; PMN, polymorphonuclear neutrophils; TWBC, total white blood cell count