Table 1.
N | % | Person-Years of Follow-up | Deaths per 1,000 Person Years | |
---|---|---|---|---|
Sex | ||||
Female | 1993 | 37.6 | 24,764 | 8.3 |
Male | 3314 | 62.4 | 40,708 | 10.4 |
Age Group, Years | ||||
35-39 | 522 | 9.8 | 6,610 | 3.8 |
40-49 | 2099 | 39.6 | 26,350 | 5.5 |
50-59 | 2494 | 47.0 | 30,267 | 13.7 |
60+ | 192 | 3.6 | 2,245 | 18.7 |
Body Mass Index, kg/m2 | ||||
< 25 | 2528 | 47.6 | 31,168 | 9.5 |
25- 30 | 2082 | 39.2 | 25,791 | 9.1 |
> = 30 | 697 | 13.1 | 8,513 | 11.5 |
Education, Years | ||||
< 12 | 632 | 11.9 | 7,720 | 13.0 |
12 | 1592 | 30.0 | 19,629 | 10.0 |
> 12 | 3083 | 58.1 | 38,123 | 8.7 |
Race | ||||
White | 5108 | 96.3 | 63,117 | 9.2 |
Black | 199 | 3.7 | 2,355 | 20.8 |
Smoking Status | ||||
Former | 1439 | 27.1 | 17,966 | 7.0 |
Intermittent | 628 | 11.8 | 7,752 | 9.5 |
Current | 3240 | 61.1 | 39,754 | 10.8 |
Randomization Group | ||||
Intervention, Ipratroprium | 1793 | 33.8 | 22,141 | 8.9 |
Intervention, Placebo | 1785 | 33.6 | 22,108 | 9.0 |
Control | 1729 | 32.6 | 21,223 | 11.0 |
Stage (pre-bronchodilator)* | ||||
Stage 3 or 4 | 67 | 1.3 | 799 | 15.0 |
Stage 2 | 3432 | 64.7 | 42,208 | 10.7 |
Stage 1 | 1354 | 25.5 | 16,852 | 7.3 |
Restricted | 69 | 1.3 | 840 | 9.5 |
Normal | 385 | 7.3 | 4,773 | 6.7 |
Stage (post-bronchodilator)* | ||||
Stage 3 or 4 | 19 | 0.4 | 224 | 13.4 |
Stage 2 | 2540 | 47.9 | 31,126 | 12.1 |
Stage 1 | 1565 | 29.5 | 19,386 | 7.8 |
Restricted | 125 | 2.4 | 1,487 | 12.1 |
Normal | 1058 | 19.9 | 13,249 | 5.8 |
*Modified chronic obstructive pulmonary disease stage, as defined in methods