Table 1 Scale (× 100) and shape parameters fitted by the Weibull model of simulated survival from a period analysis of US life tables

From: A model of the natural history of screen-detected prostate cancer, and the effect of radical treatment on overall survival

Starting age group (years)

Parameter

1979–1981

1989–1991

2002

Ratio 1989–1991 : 1979–1981

Ratio 2002 : 1979–1981

55–59

Scale × 100

0.25

0.17

0.07

0.66

0.28

60–64

Scale × 100

0.79

0.47

0.20

0.59

0.26

65–69

Scale × 100

2.84

1.54

0.70

0.54

0.25

70–74

Scale × 100

11.02

4.47

2.17

0.41

0.20

55–59

Shape

2.01

2.09

2.30

1.04

1.14

60–64

Shape

1.81

1.93

2.12

1.06

1.17

65–69

Shape

1.63

1.76

1.93

1.08

1.18

70–74

Shape

1.50

1.70

1.79

1.14

1.19

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