Skip to main content

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