Table 3

Person-time and observed, fitted background, and fitted excess cancer deaths, and attributable fraction (AF) of cancer deaths by septile of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) exposure

Cumulative TCDD score (septiles)*Person-yearsObservedFitted valueFitted backgroundFitted excessAF
<3965 9806963.7272.80−9.07−0.14
39–<22484252533.5827.745.840.17
224–<79161653232.9025.597.310.22
791–<212054532932.0623.808.250.26
2120–<614054813334.4024.509.910.29
6140–<15 80037893527.3118.638.670.32
⩾15 80039073332.0020.2711.720.37
Total99 200256255.97213.3342.640.17
  • *Cumulative TCDD score under a 15-year lag. Cut points for cumulative TCDD score categories were based on septiles of cumulative exposure of decedents, as in Steenland et al (1999).