Table 3.
Demographic and baseline smoking characteristics of subjects identified with incident PD in the CHS according to various outcome definitions
| Characteristic | Definition 1 (at least 1 data source) |
P value | Definition 2 (at least 2 data sources) |
P value | Self-report only |
P value | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PD (n = 154) |
noPD (n = 5,674) |
PD (n = 63) |
no PD (5,674) |
PD (n = 75) |
no PD (n = 5,766) |
||||||||||
| n | % | n | % | n | % | n | % | n | % | n | % | ||||
| Age at baseline | 0.26 | 0.94 | 0.06 | ||||||||||||
| 65–74 years | 108 | 70.1 | 3,759 | 66.3 | 43 | 68.3 | 3,759 | 66.3 | 58 | 77.3 | 3,815 | 77.3 | |||
| 75–85 years | 42 | 27.3 | 1,698 | 29.9 | 16 | 25.4 | 1,698 | 29.9 | 15 | 20.0 | 1,731 | 30.0 | |||
| >85 years | 4 | 2.6 | 217 | 3.8 | 4 | 6.4 | 217 | 3.8 | 2 | 2.7 | 220 | 3.8 | |||
| Male sex | 84 | 54.6 | 2,374 | 41.8 | 0.002 | 40 | 63.5 | 2,374 | 41.8 | 0.001 | 39 | 52.0 | 2,427 | 42.1 | 0.08 |
| Education | 0.58 | 0.58 | 0.48 | ||||||||||||
| <HS | 42 | 27.3 | 1,676 | 29.6 | 17 | 27.0 | 1,676 | 29.6 | 19 | 25.3 | 1,703 | 29.6 | |||
| HS | 44 | 28.6 | 1,562 | 27.6 | 17 | 27.0 | 1,562 | 27.6 | 22 | 29.3 | 1,589 | 27.6 | |||
| >HS | 68 | 44.2 | 2,419 | 42.8 | 29 | 46.0 | 2,419 | 42.8 | 33 | 44.3 | 2,457 | 42.7 | |||
| African American | 24 | 15.6 | 897 | 15.8 | 0.94 | 4 | 6.4 | 897 | 15.8 | 0.04 | 14 | 18.7 | 908 | 15.8 | 0.50 |
| Smoking status | 0.19 | 0.42 | 0.49 | ||||||||||||
| Never | 75 | 48.7 | 2,629 | 46.4 | 30 | 47.6 | 2,629 | 46.4 | 35 | 46.7 | 2,681 | 46.6 | |||
| Former | 68 | 44.2 | 2,355 | 41.5 | 29 | 46.0 | 2,355 | 41.6 | 35 | 46.7 | 2,388 | 41.5 | |||
| Current | 11 | 7.1 | 684 | 12.1 | 4 | 6.4 | 684 | 12.0 | 5 | 6.7 | 691 | 12.0 | |||
| Total pack-years | 0.26 | 0.53 | 0.66 | ||||||||||||
| Never smoker | 75 | 50.0 | 2,630 | 48.0 | 30 | 48.4 | 2,630 | 48.0 | 35 | 47.3 | 2,682 | 48.1 | |||
| 1st quartile (0–13) | 22 | 14.7 | 743 | 13.6 | 10 | 16.1 | 743 | 13.6 | 12 | 16.2 | 755 | 13.6 | |||
| 2nd quartile (14–27) | 21 | 14.0 | 675 | 12.3 | 8 | 12.9 | 675 | 12.3 | 10 | 13.5 | 685 | 12.3 | |||
| 3rd quartile (28–49) | 18 | 12.0 | 720 | 13.1 | 9 | 14.5 | 720 | 13.1 | 10 | 13.5 | 728 | 13.1 | |||
| 4th quartile (>50) | 14 | 9.3 | 716 | 13.0 | 5 | 8.1 | 716 | 13.0 | 7 | 9.5 | 723 | 13.0 | |||
| Years since quitting | 0.08 | 0.24 | 0.33 | ||||||||||||
| Never smoker | 75 | 49.3 | 2,629 | 47.0 | 30 | 47.6 | 2,629 | 47.0 | 35 | 46.7 | 2,681 | 47.2 | |||
| 30 | 21 | 13.8 | 605 | 10.8 | 9 | 14.3 | 605 | 10.8 | 11 | 14.7 | 615 | 10.8 | |||
| 20–29 | 18 | 11.8 | 561 | 10.0 | 9 | 14.3 | 561 | 10.0 | 9 | 12.0 | 570 | 10.0 | |||
| 10–19 | 15 | 9.9 | 580 | 10.4 | 7 | 11.1 | 580 | 10.4 | 9 | 12.0 | 587 | 10.4 | |||
| <10 | 12 | 7.9 | 537 | 9.6 | 4 | 6.4 | 537 | 9.6 | 6 | 8.0 | 542 | 9.5 | |||
| Current smoker | 11 | 7.2 | 684 | 12.2 | 4 | 6.4 | 684 | 12.2 | 5 | 6.7 | 691 | 12.2 | |||
HS = High school. Numbers may not add up to column total due to missing values, p values assessed by Pearson's χ2 test for dichotomous categories, Fisher's exact test for categorical variables with small numbers, score test for linear trend for ordinal variables; pack-years: quartiles of total pack-years determined among non-PD smokers.