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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