Table 1 Demographic data and symptoms of different groups

Age (mean ± SD, yr)

57.9 ± 10.3

62.5 ± 10.1

-

-

P = 0.077

Male/ Female, n (% )

19/24

12/14

-

-

P = 0.873

Former smoker , n

21

10

-

-

P = 0.431

FVC (%, mean ± SD)

65.3 ± 6.4

64.2 ± 7.1

-

-

P = 0.557

DlCO (%, mean ± SD)

51.6 ± 9.1

48.8 ± 7.5

-

-

P = 0.194

Duration of disease (mean ± SD, month)

22.8 ± 23.2

16.4 ± 18.3

-

-

P = 0.231

Heartburn, n (%)

25(58.1)

9(34.6)

58.1

73.5

P = 0.058

65.4

48.6

Chest Pain, n (%)

3(6.9)

1(3.8)

6.9

75.0

P = 0.168

96.2

38.5

Regurgitation, n (%)

1(2.3)

1(3.8)

2.3

50.0

P = 0.715

96.2

37.3

Any typical symptom

25(58.1)

10(38.4)

58.1

71.4

P = 0.113

61.6

47.1

Cough, n (%)

40(93.0)

25(96.1)

93.0

61.5

P = 0.590

3.9

25.0

Dyspnea on exertion, n (%)

38(88.0)

22(84.6)

88.4

63.3

P = 0.653

15.4

44.4

Belch, n (%)

6(13.9)

1(3.8)

13.9

85.7

P = 0.178

96.2

40.3

Difficulty swallowing, n (%)

1(2.3)

0(0)

2.3

100

P = 0.433

100

38.2

Epigastric pain, n (%)

2(4.6)

0(0)

4.6

100

P = 0.264

100

38.8