Table 2.

Frequency of KRAS mutation by smoking history in pack years

MutantWild-typeTotalFrequency (%)95% Confidence intervals (%)
Never smokers126981158-23
<5 py32528112-28
6-10 py32528112-28
11-15 py613193213-57
16-25 py104555189-31
26-50 py401061462720-35
51-75 py1651672414-36
>75 py1246582111-33
Total10238048221
  • Abbreviation: py, pack years.