Table 1 Characteristics of triple negative breast cancer cases and controls [matched on year of study entry, age at entry, days blood was in the post before processing, and cancer-free years in the study (time at risk)].
Characteristic | Cases n (%) | Controls n (%) |
|---|---|---|
Totala | 154 | 159 |
Age at study entry [mean (range), years] | 52.1 (24–80) | 52.1 (22–81) |
Year of study entry | 2004–2010 | 2004–2009 |
Age at blood draw [mean (range), years] | 52.1 (24–80) | 52.2 (22–81) |
Age at diagnosis date [mean (range), years] | 56.7 (26–87) | – |
Blood draw to diagnosis [mean (range), years] | 4.6 (0–10) | – |
Days blood in post | ||
0–1 | 116 (75.3) | 120 (75.5) |
2 | 11 (7.1) | 11 (6.9) |
3+ | 27 (17.5) | 28 (17.6) |
Smoking status | ||
Never | 94 (61.0) | 94 (59.1) |
Ex-smoker | 51 (33.1) | 53 (33.3) |
Current | 9 (5.8) | 12 (7.6) |
