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Table 4 The performance of the classification rules and the intent-flag for the records of treatments given between 1990 and 2008 in Ontario

From: Determine the therapeutic role of radiotherapy in administrative data: a data mining approach

2005-2008

 

Entire sample*

Sample B only**

 

Classification rules

Intent-flag

Classification rules

Intent-flag

(95% CI)

(95% CI)

(95% CI)

(95% CI)

% correct

95.8 (95.5, 96.1)

92.5 (92.2, 92.7)

96.8 (96.6, 96.9)

93.4 (93.2, 93.5)

% incorrect

4.2 (3.9, 4.4)

4.1 (3.9, 4.4)

3.2 (3.1, 3.4)

3.2 (3.1, 3.4)

% missing

0

3.4***

0

3.4

1990-2008

 

Entire sample

Sample B only

 

Classification rules

Intent-flag

Classification rules

Intent-flag

(95% CI)

(95% CI)

(95% CI)

(95% CI)

% correct

96.1 (95.8, 96.3)

77.5 (77.2, 77.7)

97.1 (96.9, 97.2)

78.3 (78.1, 78.4)

% incorrect

3.9 (3.7, 4.2)

3.7 (3.5, 4.0)

2.9 (2.8, 3.1)

2.9 (2.8, 3.1)

% missing

0

18.8

0

18.8

  1. *Estimated through the audit of a random sample drawn from all treatment records.
  2. **Estimated through the audit of a random sample drawn from the records for which the classification rules and the intent-flag disagreed.
  3. ***CI was not provided because the percentage of records missing intent was observed instead of being estimated through the audit.