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Table 3 Example of summary measures collected from the original publication example [7] and their corresponding estimates obtained from the reconstructed IPD

From: Enhanced secondary analysis of survival data: reconstructing the data from published Kaplan-Meier survival curves

  Original publication Reconstructed IPD
Radiotherapy arm
survival rate (1 year) 55 56.1 (49.6; 63.3)
survival rate (2 years) 41 41.1 (34.7; 48.6)
survival rate (3 years) 34 34.7 (28.4; 42.5)
median duration 14.9 14.9 (11.9; 23.0)
Radiotherapy plus cetuximab arm
survival rate (1 year) 63 64.0 (57.8; 70.9)
survival rate (2 years) 50 50.4 (43.9; 57.8)
survival rate (3 years) 47 46.7 (40.1; 54.4)
median duration 24.4 24.3 (15.7; 45.7)
Hazard ratio with 95%CI
  0.68 (0.52; 0.89) 0.73 (0.57; 0.94)