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Table 1 Summary of the data and characteristics of the colorectal cancer trial patients

From: Comparison of imputation methods for handling missing covariate data when fitting a Cox proportional hazards model: a resampling study

Characteristic Label Level N(%)
Age (years) Age Median (IQR) 62 (55-68)
   Mean(SD) 61 (9.95)
Sex Sex 1 = Female 3013(40%)
   2 = Male 4494(60%)
Site of Cancer Site 0 = Colon only 5197(69%)
   1 = Rectum/both 2310(31%)
Stage Stage 0 = Dukes' A/B 3775(50%)
   1 = Dukes' C 3732(50%)
Pre-operative PRE-RT 1 = No 7147(95%)
RT   2 = Yes 360(5%)
Post-operative RT POST-RT 1 = No 6511(87%)
planned   2 = Yes 996(13%)
Indication for CT-INDIC 1 = Clear 4320(58%)
CT   2 = Uncertain 3187(42%)
CT Schedule CT-SCH 1 = Every week 3757(50%)
   2 = Every 4 weeks 3750(50%)
  1. Key: IQR = Inter-quartile range, SD = standard deviation, RT = radiotherapy, CT = Chemotherapy