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Table 3 Improvement of Köhne prognostic index

From: Could baseline health-related quality of life (QoL) predict overall survival in metastatic colorectal cancer? The results of the GERCOR OPTIMOX 1 study

Köhne prognostic index

Variable

HR (95% CI)

P value

c-index

Schemper (%)

NRI (95% CI)

Köhne (2 vs. 1)

1.18 [0.96 – 1.47]

=0.1200

   

Köhne (3 vs. 1)

2.66 [1.84 – 3.85]

<0.0001

0.54 [0.51 -0.57] *0.54

1.6

 

Improvement of the Köhne prognostic index with clinical and QoL factors: complete-case analysis

   Köhne (2 vs. 1)

1.11 [0.80 – 1.55]

=0.5114

  

NRI at 12 months = 0.23 ([0.07; 0.46])

 

NRI at 24 months = 0.31 ([0.16; 0.44])

Köhne (3 vs. 1)

2.17 [1.25 – 3.75]

=0.0056

   
 

NRI at 36 months = 0.27 ([0.02; 0.50])

LDH (>1ULN vs. ≤ 1ULN)

2.09 [1.53 – 2.87]

<0.0001

0.67 [0.63 -0.71]

10.8

 

Mobility (2–3 vs. 1)

1.56 [1.05 – 2.32]

=0.0266

*0.66

  

Pain/discomfort (2–3 vs. 1)

1.60 [1.17 – 2.18]

=0.0031

   

Improvement of the Köhne prognostic index with clinical and QoL factors after multiple imputation

Köhne (2 vs. 1)

1.24 [0.97 – 1.58]

=0.0780

   

Köhne (3 vs. 1)

2.15 [1.43 – 3.24]

=0.0002

   

LDH (>1ULN vs. ≤ 1ULN)

1.99 [1.61 – 2.46]

<0.0001

0.66 [0.59 -0.73]

8.63 [7.74 – 10.8]

 

Mobility (2–3 vs. 1)

1.39 [1.06 – 1.83]

=0.0191

R = 65%

  

Pain/discomfort (2–3 vs. 1)

1.67 [1.20 – 2.31]

=0.0031

R = 113%

  
  1. LDH = lactate dehydrogenase.
  2. ULN = Upper Limit of Normal.
  3. * = bootstrap C-index.
  4. R = relative increase in variance due to missing data.
  5. QoL = Quality of Life.
  6. HR = Hazard ratio.
  7. NRI = net reclassification improvement.
  8. For multiple imputations, a logistic model was used: response variable = QoL scale (2–3 vs. 1) and exploratory variables were number of metastatic sites, liver involvement, WHO Performance Status, CEA, APL and LDH.
  9. Variables considered in the imputation method (last model) were selected more than 5 times among the 10 replications of multiple imputations (see statistical method).