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Table 1 Baseline characteristics of the sample; mean values and standard deviations are shown unless otherwise noted

From: Biomarkers of systemic inflammation and depression and fatigue in moderate clinically stable COPD

  All Ex-smokers Current smokers P - value
Number 120 86 (71.7%) 34 (28.3%)  
Age, yrs 66 ± 6.7 67 ± 6.9 64 ± 6.6 0.03
Females (%) 46 (38%) 30 (35%) 16 (47%) 0.4*
FEV1 % 52.5 ± 18.5 53.5 ± 18.5 47.8 ± 17.7 0.12
PaO2 (kPa) 9.2 ± 1.4 9.1 ± 1.1 9.3 ± 1.2 0.4
PaCO2 (kPa) 5.2 ±.58 5.1 ± 0.5 5.3 ± 0.7 0.05
MCFS 25.1 ±12.5 23.9 ± 12 28 ± 13.5 0.11
CES-D Median (IQR) 10 (12) 9 (12) 11 (11) 0.4#
BMI (kg/m2) 27.5 ± 5.8 27.9 ± 5.5 26.5 ± 6.4 0.22
FFMI (kg/m2) 17.8 ± 3.1 18.3 ± 3.2 17.2 ± 3.6 0.09
Pack/years Median (IQR) 40 (25.8) 38.3 (31.1) 41.9 (22.5) 0.8#
  1. # Mann-Whitney U Test; * x2-Test; IQR = Interquartile Range; FEV1 % = Forced Expiratory Volume over 1 second of predicted; PaO2 = Arterial oxygen partial pressure; kPa = kilo Pascal; PaCO2 = Arterial carbon dioxide pressure; MCFS = Manchester COPD Fatigue Scale; CES-D = Centre for Epidemiologic Studies Depression Scale; BMI = Body Mass Index; FFMI = Fat-Free Mass Index.