Table 2

Comparison of continuous features between the training and validation sets
Feature Training set (n = 189) Validation set (n = 815) % Missing data from validation set P
Age at surgery (years) Mean 62.4 66.3 0 0.0002*
SD 13.7 12.8
Median 62.7 67.0
IQR 54.4, 72.2 58.0, 76.0
Hemoglobin concentration (mg/dL)†‡ Mean 11.5 11.5 0.6 1.0
SD 1.9 3.5
Median 11.4 11.3
IQR 10.1, 12.9 10.3, 12.6
Absolute lymphocyte count (K/μL)†‡ Mean 1.2 1.2 83.8 0.48
SD 1.3 0.74
Median 1.0 1.2
IQR 0.6, 1.5 0.8, 1.6
Senior surgeon’s estimate of survival (months)†‡ Mean 10.3 N/A 100 N/A
SD 8.6
Median 6.0
IQR 4.0, 12.0

SD=standard deviation; IQR=interquartile range; N/A=not applicable.

*Distributions are significantly different between training and validation sets by two-tailed Student’s t-test.

Denotes feature of 3-month model.

Denotes feature of 12-month model.

Forsberg et al.

Forsberg et al. BMC Cancer 2012 12:493   doi:10.1186/1471-2407-12-493

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