Statistical learning methods as a preprocessing step for survival analysis: evaluation of concept using lung cancer data

Table 2 Odds Ratios

Model	SD	Age OR	Az	Covariate	Unit	Covariate OR
Accepted
Age	8.681	0.60 (0.42, 0.86)	0.636
Grade adjusted	8.681	0.58 (0.40, 0.83)	0.657	Grade	1	0.68 (0.40, 1.15)
Grade and Gender adjusted	8.681	0.63 (0.43, 0.91)	0.703	Grade	1	0.73 (0.42, 1.25)
				Gender	Male vs Female	0.38 (0.19, 0.78)
Model	SD	ln(z) OR	Az	Covariate	Unit	Covariate OR
Hybrid
z (Age and Grade)	1.695	4.15 (2.15, 8.01)	0.763
Gender adjusted	1.695	3.67 (1.88, 7.16)	0.778	Gender	Male vs. Female	0.50 (0.24, 1.05)

The odds ratios (ORs) and 95% confidence intervals (CIs) are provided parenthetically for the variables used in the logistic regression modeling. The ORs for the continuous variables (age and z) are cited per standard deviation (SD) increase in the respective variable or as a unit increase (grade) while controlling for the other variables (covariates) when applicable. The z variable includes grade and age simultaneously. The ORs for the other covariates are listed in the column to the right. The area under the receiver operating characteristic curve (Az) is also provided for each model.

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