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Table 3 Comparison of pre- and post-bronchodilator classifications from Year 1 and Year 5 visits

From: Pre- and post-bronchodilator lung function as predictors of mortality in the Lung Health Study

Year 1

Post-Bronchodilator

Pre-Bronchodilator

Stage 3 or 4*

Stage 2

Stage 1

Restricted

Normal

Total

Stage 3 or 4*

17

50

0

0

0

67

Stage 2

1

2442

578

76

335

3432

Stage 1

0

28

959

0

367

1354

Restricted

1

10

0

44

14

69

Normal

0

10

28

5

342

385

Total

19

2540

1565

125

1058

5307

Year 5

      
  

Post-Bronchodilator

  

Pre-Bronchodilator

Stage 3 or 4*

Stage 2

Stage 1

Restricted

Normal

Total

Stage 3 or 4*

172

168

0

1

0

341

Stage 2

10

2823

482

67

205

3587

Stage 1

0

27

748

0

220

995

Restricted

1

18

1

56

16

92

Normal

0

12

11

2

280

305

Total

183

3048

1242

126

721

5320

  1. The rows represent the pre-bronchodilator values and the columns represent the post-bronchodilator values (i.e. at year one 67/5307 were stage 3 or 4 pre- and 19/5307 were stage 3 or 4 post-bronchodilator). Year 1 Post-Bronchodilator
  2. *Modified chronic obstructive pulmonary disease stage, as defined in methods