Table 6 Demographics and clinical symptoms in different subgroups of IIP compared with other studies

Our study

27

4.4:1

59.4

96.3%

77.7%

1.7

66.7%

Carrington 1978, USA[23]

53

1.7:1

51

n.d.

n.d.

2.5

71%

Matuso 1996, Japan[24]

30

2.5:1

60

88.6%

100%

1.1

60%

Bjoraker 1998, USA[18]

64

1:1

65

89%

71%

n.d.

54%

Daniil 1999, UK[25]

15

4:1

56

100%

60%

1.5

80%

Nicholson 2000, UK[21]

37

8.3:1

57.2

n.d.

n.d.

1.3

78%

2: Demographics and clinical symptoms in NSIP

Author

n

m: f

age

dyspnoe

cough

symptoms (years)

smoker

Our study

14

3:4

49.2

92.9%

64.3%

1.7

57%

Bjoraker 1998, USA[18]

15

1.3:1

57

100%

85%

n.d.

57%

Katzenstein 1994, USA[33]

64

1:1.5

46

n.d.

n.d.

0.7

58%

Park 1996, Korea[34]

7

1:6

56

n.d.

n.d.

0.33

14.3%

Daniil 1999, UK[25]

15

1:1.1

56

100%

60%

1.5

60%

Nicholson 2000, UK[21]

28

2.5:1

53.5

n.d.

n.d.

0.9

64.3%

Cottin 1998, France[35]

12

1:1

52.5

100%

67%

n.d.

50%

3: Demographics and clinical symptoms in RBILD

Author

n

m: f

age

dyspnoe

cough

smoker

pack years

Our study

6

5:1

44.6

66.7%

50%

100%

26.6

Myers 1987, USA[26]

6

5:1

36

83.3%

83.3%

100%

39

Yousem 1989, USA[27]

18

1.25:1

36

67%

50%

100%

32

Myers 1992, USA[36]

?

1.7:1

36.1

70.8%

58.3%

100%

33.4

Moon 1999, UK[37]

10

1:1

47.1

70%

30%

90%

39.4

4: Demographics and clinical symptoms in COP

Author

n

m: f

age

dyspnoe

cough

smokers

Our study

10

7:3

54.8

70%

80%

70%

Nagai 1998, Japan[19]

16

1:2

56.9

n.d.

n.d.

31%

Guerry-Force 1987, Canada[29]

15

3:1

56

78.5%

86%

54.5%

Costabel 1992, Germany[38]

10

7:3

55

90%

90%

n.d.

Müller 1987, Canada[31]

15

11:4

56.6

78.6%

86.7%

54.5%

King 1992, USA[32]

112

1.2:1

58

49%

72%

57%

Izumi 1992, Japan[39]

34

1:1

57

47%

76%

44%