Table 1.
Participant characteristics at baseline
| Variable | Total (n = 256) | Participants with at least one SSN (n = 41) | Participants with no SSNs (n = 215) | p-value |
|---|---|---|---|---|
| Males | 171 (66.8) | 27 (65.9) | 144 (67.0) | 0.89 |
| Age (yearsa) | 64 (59–74) | 63 (60–74) | 64 (59–74) | 0.27 |
| Current smokerb | 121 (47.3) | 19 (46.3) | 102 (47.4) | 0.90 |
| Smoking pack year history (pack years) | 56 (26–235) | 51 (33–150) | 56 (26–235) | 0.20 |
| Airflow limitation on spirometryc | 155 (60.5) | 27 (65.9) | 128 (59.5) | 0.45 |
| FEV1% predicted | 95.0 (46.6–155.6) | 90.0 (54.8–129.7) | 95.7 (46.6–155.6) | 0.17 |
| Body mass index (kg m−2) | 28.3 (18.1–42.3) | 27.9 (18.1–42.3) | 28.4 (20.5–40.6) | 0.84 |
| First-degree relative with lung cancer | 46 (18.0) | 8 (19.5) | 38 (17.7) | 0.78 |
| Caucasian ethnicity | 254 (99.2) | 40 (97.6) | 214 (99.5) | 0.30 |
FEV1, forced expiratory volume in 1 s; SSN, subsolid nodule.
Data presented as either n (%) or median (range).
a
Rounded down to nearest year.
b
Self-reported current smoker or quit <6 months prior to enrolment.
c
FEV1/forced vital capacity ratio <70%.