Table 1 Demographic and clinical characteristics of COPD patients

Age (years)*

73.3 (71.6 ± 10.3)

68.8 (68.0 ± 8.6)

69.6 (68.8 ± 11.1)

74.2 (73.3 ± 9.4)

71.8 (70.4 ± 10.1)

Gender (Male)

100 (58.8)

152 (86.9)

125 (74.4)

117 (70.9)

494 (72.9)

Education (<9 years)

53 (31.4)

37 (21.1)

36 (21.4)

53 (32.1)

179 (26.4)

Medical insurance

166 (97.6)

156 (89.1)

164 (97.6)

163 (98.8)

649 (95.7)

Smoking

40 (23.7)

40 (22.9)

25 (14.9)

26 (15.8)

131 (19.4)

Age at diagnosis (years)*

64.0 (61.4 ± 13.9)

66.5 (64.7 ± 9.7)

61.9 (61.3 ± 13.3)

60.4 (59.4 ± 15.5)

63.9 (61.7 ± 13.3)

Course of illness (years)*

6.6 (10.2 ± 12.2)

1.4 (3.2 ± 4.6)

3.8 (7.6 ± 9.4)

8.6 (13.9 ± 14.2)

3.8 (8.7 ± 11.3)

Family history

39 (23.1)

40 (22.9)

38 (22.6)

61 (37.2)

178 (26.3)

FEV1 (liter)*

1.5 (1.4 ± 0.5)

1.4 (1.5 ± 1.0)

1.2 (2.2 ± 2.2)

1.1 (1.2 ± 0.7)

1.3 (1.6 ± 1.3)

FEV1% predicted*

58.7 (57.4 ± 19.5)

56.0 (57.8 ± 24.6)

49.0 (52.1 ± 22.4)

47.0 (49.9 ± 24.4)

53.0 (54.5 ± 23.0)

Co-morbidities

158 (92.9)

96 (54.9)

130 (77.4)

150 (91.5)

534 (78.9)

Current severity level

Mild

31 (18.2)

35 (20.0)

37 (22.0)

37 (22.4)

140 (20.6)

Moderate

86 (50.6)

79 (45.1)

61 (36.3)

70 (42.4)

296 (43.7)

Severe

40 (23.5)

39 (22.3)

57 (33.9)

45 (27.3)

181 (26.7)

Very severe

13 (7.6)

22 (12.6)

13 (7.7)

13 (7.9)

61 (9.0)

Total

170 (100)

175 (100)

168 (100)

165 (100)

678 (100)