Table 2.

SIR for cervical cancer in full and half-siblings according to the Family-Cancer Database

Sibling typeInvasive only
Invasive + in situ
Invasive + in situ (adjusted)*
ObservedSIR (95% CI)ObservedSIR (95% CI)ObservedSIR (95% CI)
Full sibling341.92 (1.33-2.68)8,0691.82 (1.78-1.86)8,0691.84 (1.81-1.88)
Paternal half-sibling21.38 (0.13-5.07)7341.56 (1.45-1.67)7341.27 (1.18-1.36)
Maternal half-sibling06771.79 (1.67-1.93)6771.40 (1.30-1.51)
Any half-sibling20.75 (0.07-2.77)1,4111.64 (1.56-1.72)1,4111.31 (1.24-1.37)
  • NOTE: Boldfaced, 95% CI and 99% CI do not include 1.00.

  • * Adjusted for the number of parents with whom parents had children.