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Table 2 Proportion screen detected, and mean and median lead-time (in years) among screen detected cases in different simulation screening scenarios

From: Assessing lead time bias due to mammography screening on estimates of loss in life expectancy

Attendance

Screening

Number diagnosed

% screen detected

Lead time (mean)

Lead time (median)

Perfect

Low

2999 (2901–3098)

35.2 (33.7–37.1)

2.01 (1.83–2.22)

1.01 (0.92–1.10)

Perfect

Moderate

3028 (2925–3136)

45.1 (43.2–47.1)

2.45 (2.27–2.64)

1.34 (1.22–1.45)

Perfect

High

3062 (2959–3171)

53.0 (51.0–54.9)

2.98 (2.80–3.22)

1.72 (1.61–1.84)

Imperfect

Low

2988 (2887–3075)

27.1 (25.1–28.8)

1.98 (1.74–2.27)

1.01 (0.91–1.11)

Imperfect

Moderate

3010 (2904–3106)

35.3 (33.7–36.8)

2.42 (2.22–2.67)

1.32 (1.19–1.45)

Imperfect

High

3035 (2928–3143)

42.1 (40.6–44.0)

2.93 (2.71–3.19)

1.70 (1.55–1.83)

  1. All numbers are averages (with 2.5 and 97.5 percentiles in parenthesis) based on 200 simulations