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Table 1 Study design and size

From: Reporting methods in studies developing prognostic models in cancer: a review

  % (n = 47) articles
Study design  
   RCT* 11 (5)
   Prospective cohort study 21 (10)
   Database or other retrospective cohort 68 (32)
Reason for sample size  
   No reason given 77 (36)
   Justified time interval (clinical or technology) 4 (2)
   Trial size (RCT or cohort) 19 (9)
Power calculation reported 0 (0)
  Median (IQR) [range]
Eligible for study:  
   Number of patients (n = 35) 403 (148 to 833)
   Number of events (n = 20) 112 (62 to 289)
Included in analysis:  
   Number of patients (n = 45) 342 (130 to 684)
   Number of events (n = 33) 110 (61 to 230)
Number of events per candidate variable (n = 28) 10 (5 to 33) [2 to 95]
  1. *RCT randomised controlled trial