CODE SHEET FOR MONT25.DAT DATA FILE

Condensed data for the 1479 Montana smelter workers employed prior to 1925.

                            REFERENCES

Lee AM and Fraumeni JF (1969) Arsenic and respiratory cancer in man:
an occupational study. J Natl Cancer Instit 42: 1045-1052

Lee-Feldstein A (1983) Arsenic and respiratory cancer in humans: Follow-up
of copper smelter employees in Montana. J Natl Cancer Instit 70: 601-610

Breslow NE, Lubin JH, Marek P and Langholz B. (1983) Multiplicative models
and cohort analysis. J Am Statist Assoc 78: 1-12

Breslow NE and Day NE (1987) Statistical Methods in Cancer Research II:
Design and Analysis of Cohort Studies. IARC Scientific Publication No. 82,
Lyon: IARC. 

VARIABLE   COLUMNS   FORMAT   NAME               DESCRIPTION
----------------------------------------------------------------------------

   1         1-  5    I5      ID Number

   2         6-  8    I3      Cause of death    ICD 7th Revision til 1/64
                                                ICD 8th Revision from 1/64

   3         9- 12    F4.2    Age at entry      Age in years at entry to
                                                follow-up

   4        13- 16    F4.2    Year of entry     Calendary year at entry

   5        17- 20    F4.2    Age at exit       Age at death or withdrawal

   6        21- 25    F5.2    Year hired        Calendar year of first hire

   7        26- 29    F4.2    Year terminated   Calendar year last worked

   8        30- 33    F4.2    Duration          Years from hire to exit

   9        34- 35    I2      Birthplace        NCI codes: see below

  10        36- 36    I1      Marital status    1 = married
                                                2 = single, separated, widow
                                                3 = unknown
                                                9 = unknown

 11-25      37- 81    15F3.1  Years Mod As      Cumulative number of years
                                                spent in moderate exposure
                                                areas for each of 15 calendar
                                                periods:
                                                    1 = Before 1910
                                                    2 = 1910-1914
                                                       ....
                                                   15 = 1975-1977

 26-40      82-126    15F3.1  Years Heavy As    As above, for heavy arsenic

 41-55     127-171    15F3.1  Years Light As    As above, for all other areas
-----------------------------------------------------------------------------

NCI Country Codes:

01  Anaconda       30  England, Wales , N. Ireland   40 Germany
00  Butte          31  Scotland                      41 Italy
10  Other Montana  32  Ireland                       42 Other W. Europe
20  Other US
21  US, nos

50  Austria                         70  Canada
51  Austria-Hungary, nos            71  Other Americas and Carribean
52  Hungary                         72  Africa
60  Checkoslovakia, Bohemia         73  Asia and Middle East
61  Poland                          74  Australia
62  USSR, Armenia                   75  Scandinavia
63  Yugoslavia, Croatia, Serbia     76  All other countries
64  Other E. Europe                 90  Unknown