Table 3. Estimated mean and median Symptom Lead Time (SLT) in months for lung and colorectal cancers.

Investigative criteria	Mean SLT	Median SLT
Lung cancer
Two different symptoms in 3 months	4.7 (4.0–5.5)	2.4 (2.0–2.8)
Cough	6.0 (4.9–7.1)	3.2 (2.6–5.1)
Any symptom	5.5 (4.8–6.3)	2.9 (2.6–3.9)
Any two symptoms in 3 months	4.9 (4.2–5.6)	2.6 (2.2–3.0)
Chest pain	5.5 (4.3–6.9)	2.5 (1.9–4.0)
Colorectal cancer
Any symptoms	4.9 (4.3–5.6)	2.6 (2.1–3.3)
Rectal bleeding	4.6 (3.8–5.5)	2.4 (1.9–3.4)
Any two symptoms in 6 months	4.4 (3.8–5.1)	2.2 (1.8–2.9)
Two different symptoms in 6 months	4.1 (3.4–4.8)	2.0 (1.7–2.7)
Abdominal pain	5.0 (4.1–5.9)	2.7 (2.0–4.1)