Table 7.
Characteristics of Patients With and Without ≥3 Years of Follow-up
| Variable | Study Cohort (n = 113) | <3 y Follow-upa (n = 62) | P Value |
|---|---|---|---|
| Age, median (IQR), y | 61 (15) | 57 (17) | .46 |
| Female sex | 66 (58%) | 37 (60%) | .87 |
| Race | .26 | ||
| White | 97 (86%) | 56 (90%) | |
| Black | 4 (3.5%) | 2 (3.2%) | |
| Asian/Pacific Islander | 9 (8.0%) | 1 (1.6%) | |
| Hispanic or Latino | 3 (2.7%) | 2 (3.2%) | |
| Native American | 0 (0%) | 1 (1.6%) | |
| Smoking status | .36 | ||
| Never | 35 (31%) | 15 (24%) | |
| Former | 51 (45%) | 35 (57%) | |
| Current | 27 (24%) | 12 (19%) | |
| Pack-years, median (IQR), yb | 27 (35) | 19 (26) | .17 |
| Years since quit, median (IQR), yc | 16 (20) | 20 (20) | .43 |
| Nodule characteristicsd | |||
| Size | |||
| Median (IQR), mm | 8 (13) | 5.9 (6.1) | .002 |
| Size category | .023 | ||
| ≤ 4 mm | 20 (18%) | 23 (37%) | |
| > 4-6 mm | 22 (20%) | 12 (19%) | |
| > 6-8 mm | 17 (15%) | 9 (15%) | |
| > 8 mm | 54 (48%) | 18 (29%) | |
| Density | .36 | ||
| Solid | 98 (87%) | 57 (92%) | |
| Partially-solid | 12 (11%) | 5 (8.1%) | |
| Ground-glass opacity | 3 (2.7%) | 0 (0%) |
See Table 1 legend for expansion of abbreviation.
a
Of the 104 subjects with less than 3 years of follow-up, 62 were included in the analysis. Of the 42 who were excluded, 23 did not have an incidentally-detected nodule, 7 had imaging performed for a fever, 15 had malignancy within the last 5 years, and 3 were younger than age 35 years.
b
Among 125 current or former smokers.
c
Among 86 former smokers.
d
Refers to the dominant nodule.