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Table 1 Demographic and clinical characteristics of COPD patients

From: Quality of life and its association with direct medical costs for COPD in urban China

Characteristics Beijing (%) Guangzhou (%) Shanghai (%) Chengdu (%) Total (%)
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)
  1. *Median (Mean ± standard deviation).
  2. Abbreviations: FEV1 forced expiratory volume in one second, FEV1% predicted the percentiles of forced expiratory volume in one second to the predicted value.