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Table 1 Demographic characteristics of participants

From: Genetic influences on right ventricular systolic pressure (RVSP) in chronic obstructive pulmonary disease (COPD)

Characteristics All COPD patients Subgroup with RVSP results Subgroup without measureable RVSP Pvalue
Males/Females 364/216 167/111 42/21  
%Males/%Females 63/37 60/40 67/33  
Mean (SD) age at recruitment (yr) 68.1 (9.3) 69.3 (9.0) 67.3 (9.8) 0.11
Range 35.1–87.0 38.3-87.0 35.1-81.2  
Median smoking history (pack years) 50 50 47 0.93
(IQR) (33.8-69.0) (31.5-69.0) (34.0-68.8)  
Range 0.0-186.0 0.0-186.0 8.5-172.5  
Chronic bronchitis present (% of total) 201 (35%) 99 (36%) 26 (41%) 0.33
Mean (SD) FEV1 (L) 1.2 (0.63) 1.20 (0.55) 1.13 (0.50) 0.40
Range 0.2-4.7 0.2-3.9 0.34-3.09  
Mean (SD) FEV1% predicted 50 (21.8) 50 (20.8) 44.5 (18.1) 0.062
Range 7-129 7-129 11.4-89.3  
Mean (SD) VC (L) 2.8 (0.92) 2.7 (0.83) 2.81 (0.87) 0.28
Range 0.9-6.4 0.9-5.6 1.15-4.88  
Mean (SD) VC (L) % predicted 77.3 (17.8) 76.0 (17.4) 75.5 (16.6) 0.88
Range 28.5-132.3 28.8-132.3 36.3-111.0  
Mean (SD) FEV1/VC ratio % 45 (15) 45 (14) 40.9 (13.5) 0.026
Range 7-80 7-80 17.5-67.9  
Mean (SD) KCO (ml/min/mmHg/L) 2.5 (0.96) 2.4 (0.97) 2.56 (0.97) 0.36
Range 0.44-6.6 0.44-6.6 0.49-4.7  
Mean (SD) KCO % predicted 58 (22.5) 58 (23.4) 59.8 (22.4) 0.60
Range 9.8-134.5 12.6-134.5 9.8-109.8  
Mean (SD) RVSP (mmHg) 44.2 (12.7) 44.2 (12.7) Unable to  
Range 16.0-94.0 16.0-94.0 measure  
Mean (SD) PaO2 (mmHg) 70.5 (11.6) 69.4 (11.8) 71.7 (11.5) 0.23
Range 35.0-99.0 35.0-99.0 53.0-95.0  
Mean (SD) PaCO2 (mmHg) 41.3 (7.7) 41.6 (8.1) 40.8 (7.7) 0.49
Range 26.0-76.0 27.0-76.0 26.0-62.0  
Mean (SD) BMI (kg/m2) 25.0 (5.5) 24.9 (5.3) 26.0 (5.5) 0.14
Range 13.0-46.1 13.5-44.0 15.9-46.1