Table 1

 Distribution of workers by sex, alachlor exposure status, and follow up status

Mortality study
Total workforce10913001391
No alachlor exposure (excluded)12560185
Alachlor exposed9662401206
    Lost to follow up4711
Incidence study
Mortality cohort9662401206
Non-whites (excluded)321244
Left Iowa before 1969 (excluded)415
Never lived in Iowa (excluded)404
Incidence sub-cohort9262271153
    In Iowa through study end or death date629157786
    Left Iowa, date known27460334
    Incomplete residence history231033
    Incident cancers29736