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Table 1 Candidate prognostic factors in the derivation and validation datasets

From: External validation of a Cox prognostic model: principles and methods

Variable name Variable (Definition/units)   n(%) or mean (SD)  
    Derivation Validation
Tumour size sized0 (≤20 mm) 501 (32%) 180 (26%)
  sized1 (20 to 50 mm) 783 (51%) 453 (66%)
  sized2 (>50 mm) 262 (17%) 53 (8%)
Menopausal status meno (premenopausal) 628 (41%) 290 (42%)
   (postmenopausal) 918 (59%) 396 (58%)
Hormone treatment hormon (no) 1207 (78%) 440 (64%)
   (yes) 339 (22%) 246 (36%)
Age age (years) 56.0 (13.0) 53.1 (10.1)
Positive lymph nodes nodes (number) 5.2 (4.9) 5.0 (5.5)
Progesterone recep. pgr (fmol/l) 156 (299) 110 (202)
Oestrogen recep. er (fmol/l) 165 (267) 96 (153)
  1. Values in parentheses are category percentages for categorical variables, and SD for continuous variables. Recep. = receptors.