Skip to main content
. Author manuscript; available in PMC: 2016 Apr 21.
Published in final edited form as: Lung Cancer. 2010 Nov 13;72(3):322–326. doi: 10.1016/j.lungcan.2010.10.010

Table 2.

Lead time estimation for male heavy smokers using Mayo Lung Project data.

Δ Number of screens P1 (%) 1−P1 (%) Mode (months) Mean (years) S.E. (years)
6 mo 60 16.79 83.21 1.68 1.18 1.79
9 mo 40 25.30 74.70 1.20 1.07 1.77
12 mo 30 32.74 67.26 0.96 0.98 1.74
18 mo 20 44.65 55.35 0.72 0.84 1.69

Δ = ti − ti−1 is the time interval between two screens. P1 = P(L = 0|D = 1) is the probability of lead time equals to zero, i.e. “no-early-detection.” The columns of P1 and (1 − P1) are in percentages.