Table 2: Parameter estimates from lung cancer risk model^a in duration of exposure and year of first exposure.

Models

Parameters

A

B

C

D

E

F

19.83

2.563

5.261

1.276

0.930

0.326

1.171

1.259

1.511

1.081

1.686

Year of first exposure^b

<1955

1.00

1.00

1.00

1.00

1.00

1955-59

0.75

0.73

0.66

0.72

0.90

1960

0.24

0.19

0.17

0.14

0.20

Time since last exposure

<10

1.00

1.00

1.00

1.00

10-19

0.61

0.66

0.60

0.77

0.57

20+

0.26

0.30

0.25

0.39

0.23

Attained age group

<50

1.00

1.00

1.00

1.00

1.00

50-59

0.09

0.30

0.35

0.22

0.36

60-69

0.01

0.10

0.13

0.08

0.14

70

0.003

0.06

0.09

0.04

0.04

Attained age - 60

1.09

Change in deviance ^c

-^d

12.2

14.9

26.4

26.3

27.8

^a Fitted risk model, RR = 1 + ß× d^k × Ý_yfe × tsle × age × (age-60), where d is duration of exposure, yfe is calendar year of first exposure, and tsle is time since last exposure.

^b Data include 310, 141, and 19 lung cancer cases in each category.

^c Change in deviance tests difference in model fit compared with model in column A. Value is asymptotically chi-squared with degrees of freedom equal to the number of omitted parameters.

^d Deviance of model was 2,557.7 on 17,215 degrees of freedom.