Table 1 Distribution of the demographic data and comorbidities of the study participants

Age

 Mean (SD)

45.58 (15.36)

39.12 (14.99)

 < 0.001

39.16 (15.00)

Follow years

 Mean (SD)

8.47 (2.49)

11.71 (0.91)

< 0.001

11.69 (0.96)

HT

161

45.6%

19,464

30.4%

< 0.001

19,625

30.5

DM

61

17.3%

7023

11.0%

< 0.001

7084

11.0

Stroke

19

5.4%

2586

4.0%

0.255

2605

4.0

Head injury

27

7.6%

5237

8.2%

0.787

5264

8.2

CKD

10

2.8%

1584

2.5%

0.796

1594

2.5

IHD

97

27.5%

10,776

16.8%

< 0.001

10,873

16.9

Alcoholism

7

2.0%

975

1.5%

0.629

982

1.5

Nicotine

5

1.4%

1814

2.8%

0.149

1819

2.8

Asthma

50

14.2%

7581

11.9%

0.208

7631

11.9

COPD

104

29.5%

13,997

21.9%

0.001

14,101

21.9

RA

1

0.3%

191

0.3%

1.000

192

0.3

IC

44

12.5%

3466

5.4%

< 0.001

3510

5.5%

SUOM

41

11.6%

3651

5.7%

< 0.001

3692

5.7%

CSOM

2

0.6%

196

0.3%

0.296

198

0.3%

Otosclerosis

0

0

14

0.02%

1.000

14

0.02%

Insurance fee

 Lowest

59

16.7%

10,633

16.6%

0.316

10,692

16.6

 2nd

102

28.9%

20,987

32.8%

21,089

32.8

 3rd

91

25.8%

14,280

22.3%

14,371

22.3

 Highest

101

28.6%

18,068

28.2%

18,169

28.2

Urbanization

 Highly

108

30.6%

21,946

34.3%

0.002

22,054

34.3

 Moderately

138

39.1%

20,837

32.6%

20,975

32.6

 Boomtown

40

11.3%

10,856

17.0%

10,896

16.9

 Others

67

19.0%

10,329

16.1%

10,396

16.2