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. Author manuscript; available in PMC: 2014 Sep 1.
Published in final edited form as: Lung Cancer. 2013 Jun 24;81(3):347–353. doi: 10.1016/j.lungcan.2013.05.011

Table 7 Continuous Variable Associations between Patient Characteristics and KRAS Mutation

Variable KRAS Wild type KRAS Mutant t test p value
N Mean ± SE N Mean ± SE
Pack years* 200 34.6 ± 1.9 97 36.6 ± 2.6 0.56
Age 269 63.9 ± 0.7 105 63.1 ± 1.0 0.52
Charlson Index 268 5.6 ± 0.1 105 5.7 ± 0.2 0.66
Charlson & age 268 7.6 ± 0.2 105 7.7 ± 0.2 0.92
*

Former or current smokers only