Page 325 - Contributed Paper Session (CPS) - Volume 7

CPS2113 Lucia Pereira B. et al.

where Ikr is the response for death k on item j, taking on a value of 1
when the response is positive and 0 when the response is negative.

Assignment of underlying cause of death
The assignment of the underlying cause of death to a new individual (k)
is made on the basis of the Tariff-ordered score for each cause. The simplest
idea would be to assign the cause for which the Tariff-Score was the largest.
However, some causes have a naturally higher score and then classification is
based on ranks. The Tariff Score of individual k is calculated for each of the
possible causes.
The original sample is sorted from lowest to highest value. The Tariff-
score of the new individual is included in this order for each possible cause.
The new individual is assigned the cause that presents the highest rank.
For this analysis we consider the chapter classification of ICD10 -
International Statistical Classification of Diseases (World Health Organization
- WHO). Table 1 shows the counts of cases classified according to the gold
standard and by the Tariff method.

Conclusion
 The most common underlying cause is Ischemic Heart Disease, totaling
414 cases out of 1262 observed, that represents, 32.8%.
 Considering the 414 cases of Ischemic Heart Disease, 150 were classified
correctly by the Tariff method, which means 36.20% accuracy.
 Considering 633 cases (excluding Other Diseases), 261 cases were
correctly classified, 39.4%.

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