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Table 3 Observed and with different multiple imputation methods predicted T- and UICC-stage-specific numbers of cases for breast cancer and malignant melanoma

From: Imputation of missing values of tumour stage in population-based cancer registration

   Breast cancer Malignant melanoma
   Observed PR PMM RF Prop Observed PR PMM RF Prop
T-stage            
1 N 8,909.0 8,903.2 8,903.5 8,788.2 8,950.5 1,017.0 1,009.8 1,014.5 962.3 1,013.7
  SD 94.4 96.5 96.5 108.6 97.6 31.9 37.4 38.2 207.2 37.3
2 N 6,235.0 6,236.7 6,239.5 6,394.9 6,228.6 338.0 341.8 340.2 332.7 341.2
  SD 79.0 82.6 83.0 83.3 84.1 18.4 26.8 29.9 116.8 25.7
3 N 944.0 944.5 946.7 944.9 936.4 214.0 212.1 209 242.1 209.0
  SD 30.7 33.0 33.3 33.8 32.7 14.6 18.7 19.2 129.6 17.7
4 N 1,074.0 1,077.6 1,072.3 1,034.1 1,046.5 116.0 121.3 121.3 147.9 121.1
  SD 32.8 36.3 35.9 57.3 35.3 10.8 13.6 15.5 121.8 16.6
MAD    59.8 57.8 341.9 104.1   48.4 55.4 409.2 49.2
  SD   23.3 30.1 97.5 30.4   23.5 26.1 242.6 20.3
UICC-stage            
I N 6,859.0 6,865.7 6,856.7 6,096.1 6,642 1,321.0 1,269.8 1,276.8 1,213.7 1,267.8
  SD 82.8 85.4 85.4 261.0 85.5 36.3 39.5 41.1 222.0 41.7
II N 7,123.0 7,119.5 7,133.9 6,891.8 7,295.9 216.0 204.4 208.4 271.1 238.6
  SD 84.4 87.5 87.4 425.7 88.8 14.7 24.7 24.8 143.1 21.5
III N 2,371.0 2,361.7 2,351.9 3,206.1 2,462.6 122.0 149.9 124.5 173.4 143.6
  SD 48.7 53.2 53.0 381.6 58.4 11.0 21.2 22.9 199.8 17.5
IV N 809.0 815.1 819.5 968.0 761.5 26.0 60.9 75.2 26.9 35.0
  SD 28.4 31.3 31.6 593.6 32.2 5.1 14.8 18.4 8.6 9.5
MAD    68.5 72.7 2182.4 528.8   133.9 126.9 344.4 107.5
  SD   25.8 30.9 988.5 47.2   28.1 35.6 411.8 41.5
  1. N Number of cases
  2. SD Standard deviation
  3. PR Polytomous regression
  4. PMM Predictive mean matching
  5. RF Random forests
  6. Prop Proportional sampling
  7. MAD Mean absolute difference between the predicted number of caces in all 50 imputations and the observed number of cases.