| | First author, year [Ref] | Location | No. of participants (R/A) | Age
Mean ± SD
(years) | Severity of COPD | COPD History
Mean ± SD
(years) |
| Xu
2007 [7] | China | T: 30/30
C: 30/30 | T:
C: | T: II: 12, III: 18
C: II: 13, III: 17 | NR | Hong
2004 [8] | China | T: 20/20
C: 18/18 | T:
C: | T: II: 5, III: 15
C: II: 4, III: 14 | T:
C: | Jia
2007 [9] | China | T: 30/30
C: 25/25 | T:
C: | T: I: 5, II: 18, III: 7
C: I: 3, II: 17, III: 5 | T:
C: | Wang
2005 [10] | China | T: 20/20
C: 20/20 | T:
C: | T: II A: 8, II B: 9, III: 3
C: II A: 9, II B: 9, III: 2 | T:
C: | Cui
2004 [11] | China | T: 20/20
C: 20/20 | T: 62.5
C: 61.5 | NR | NR | Lin
2003 [12] | China | T: 30/30
C: 30/30 | T: 62
C: 60.5 | NR | T:
C: | Zhang
2006 [13] | China | T: 24/24
C: 22/22 | T:
C: | T: II: 5, III: 19
C: II: 4, III: 18 | T:
C: | Feng
2006 [14] | China | T: 36/36
C: 33/33 | 48–73 | NR | NR | Zhao
2003 [15] | China | T: 15/15
C: 15/15 | T:
C: | NR | NR | Li
2006 [16] | China | T: 85/85
C: 40/40 | T: 53
C: 49 | NR | T:
C: | Xu
2004 [17] | China | T: 25/25
C: 24/24 | T:
C: | NR | T:
C: | Luo
2002 [18] | China | T: 36/36
C: 20/20 | T:
C: | NR | T:
C: | Wang
2007 [19] | China | T: 30/30
C: 30/30 | T: 62.8
C: 60.5 | NR | T:
C: | Huang
2008 [20] | China | T: 16/16
C: 16/16 | T:
C: | T: II: 8, III: 8
C: II: 8, III: 8 | NR | He
2010 [21] | China | T: 49/49
C: 49/49 | | NR | | Guan
2006 [22] | China | T: 37/30
C: 37/30 | T:
C: | T: 0:7, I: 4, II: 4, III: 15
C: 0:4, I: 5, II: 11, III: 10 | NR | Wei
2007 [23] | China | T: 60/60
C: 60/60 | Not reported | NR | NR | Ma
2010 [24] | China | T: 30/30
C: 30/30 | Not reported | I to II | NR | Ding
2009 [25] | China | T: 53/53
C: 53/53 | T:
C: | T: I: 35, II: 18
C: I: 31, II: 22 | T:
C: | Zhou
2005 [26] | China | T: 30/30
C: 30/30 | T:
C: | NR | NR | |
Hu, 2009 [27] | China | T: 35/35
C: 32/32 | T:
C: | NR | NR | Chen
2009 [28] | China | T: 30/30
C: 30/30 | 70.1 | NR | NR | Liang
2009 [29] | China | T: 32/32
C: 33/33 | T: 69.73
C: 70.69 | T: I: 0, II: 13, III: 12, IV: 7
C: I: 0, II: 15, III: 12, IV: 6 | T:
C: | Zhang
2009 [30] | China | T: 60/56
C: 60/48 | 68.4 | NR | NR | Tatsumi
2002 [31] | Japan | T: 34/34
C: 37/37 | Not reported | II to III | NR |
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