Table 2.
Baseline characteristics of PLCO participants who responded to the Supplemental Questionnaire (SQX), non-responders, and those were deceased or otherwise ineligible to complete the SQX
| SQX Responders N=104,478 | SQX Non-Responders N=30,370 | Deceased/Ineligible* N=20,049 | |
|---|---|---|---|
| N (%) | |||
| Gender | |||
| Male | 49,602 (47.5) | 14,878 (49.0) | 12,202 (60.9) |
| Female | 54,876 (52.5) | 15,492 (51.0) | 7,847 (39.1) |
| Age at Randomization (years) | |||
| 55–59 | 37,385 (35.8) | 10,403 (34.3) | 3,899 (19.4) |
| 60–64 | 33,226 (31.8) | 8,850 (29.1) | 5,475 (27.3) |
| 65–69 | 22,549 (21.6) | 6,695 (22.0) | 5,686 (28.4) |
| 70+ | 11,318 (10.8) | 4,422 (14.6) | 4,989 (24.9) |
| Race | |||
| White | 93,536 (89.5) | 23,248 (76.6) | 15,795 (78.8) |
| Black | 3,225 (3.1) | 3,165 (10.4) | 1,318 (6.6) |
| Other/Missing | 7,717 (7.4) | 3,957 (13.0) | 2,936 (14.6) |
| BMI (kg/m2) | |||
| 18.5–25 | 34,588 (33.1) | 8,888 (29.3) | 6,087 (30.4) |
| 25–30 | 43,193 (41.3) | 11,862 (39.1) | 7,429 (37.1) |
| >30 | 23,283 (22.3) | 7,744 (25.5) | 4,592 (22.9) |
| Unknown/Missing | 3,414 (3.3) | 1,876 (6.2) | 1,941 (9.7) |
| Smoking Status | |||
| Never smoker | 49,584 (47.5) | 13,214 (43.5) | 6,474 (32.3) |
| Former Smoker | 44,035 (42.2) | 11,916 (39.2) | 8,666 (43.2) |
| Current Smoker | 8,777 (8.4) | 3,893 (12.8) | 3,385 (16.9) |
| Unknown/Missing | 2,082 (2.0) | 1,347 (4.4) | 1,524 (7.6) |
*
Ineligibles include those who withdrew from follow-up or were lost to follow-up prior to administration of the SQX