Table 1.
Population and Sample Characteristics*
| ALL SUBJECTS WHO UNDERWENT A CT IN 2012 | RANDOM SAMPLE OF SUBJECTS WHO UNDERWENT A CT IN 2012 | |
|---|---|---|
| n=2,253 | n=499 | |
| Median age (range), years | 65 (18–89) | 66 (20–89) |
| Men | 43% | 43% |
| RACE | ||
| White | 83% | 83% |
| Black | 4.6% | 3.8% |
| Asian | 5.8% | 6.4% |
| AI/AN | 1.5% | **** |
| NH or other PI | 0.9% | 1.2% |
| Multiple | 0.3% | **** |
| Unknown | 4.0% | 4.4% |
| Hispanic | 4.1% | 5.2% |
| COMORBIDITY INDEX | ||
| 0 | 86% | 82% |
| 1 | 3.7% | 4.4% |
| 2+ | 11% | 14% |
| HISTORY OF MALIGNANCY** | ||
| Head and neck | 6.0% | 6.8% |
| Breast | 8.0% | 8.6% |
| Prostate | 2.9% | 2.2% |
| Colorectal | 3.2% | 3.2% |
| Other | 13% | 13% |
| Any/multiple | 27% | 28% |
| SMOKING STATUS*** | ||
| Never | 48% | 50% |
| Former | 41% | 37% |
| Current | 11% | 12% |
| Missing | 0.6% | **** |
| MEDIAN PACK-YEARS**** (RANGE) | 23 (11–43) | 30 (12–46) |
| Missing | 31% | 28% |
Notes: Alaskan Native (AN), American Indian (AI), Native Hawaiian (NH), Pacific Islander (PI)
*
Information obtained from administrative data, tumor registry data, and structured data elements within the electronic health record (e.g., smoking status).
**
Columns do not necessarily add up to 100 percent. Data for esophageal cancer and melanoma are not shown because there were five or fewer subjects within one of the samples.
***
Ascertained using structured data elements within the electronic health record. These data were obtained within a median of 18 days (range 1–2,593 days) prior to the date of the CT.
****
Calculated among former and current smokers.