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. Author manuscript; available in PMC: 2009 Sep 29.
Published in final edited form as: Clin Cancer Res. 2008 Sep 15;14(18):5731–5734. doi: 10.1158/1078-0432.CCR-08-0646

Table 2.

Frequency of KRAS mutation by smoking history in pack years (py)

Mut wt Total Frequency 95% CI
Never Smokers 12 69 81 15% 8%-23%
<5 py 3 25 28 11% 2%-28%
6-10 py 3 25 28 11% 2%-28%
11-15 py 6 13 19 32% 13%-57%
16-25 py 10 45 55 18% 9%-31%
26-50 py 40 106 146 27% 20%-35%
51-75 py 16 51 67 24% 14%-36%
>75 py 12 46 58 21% 11%-33%
total 102 380 482 21%