Table 1 Cross-tabulation showing concordance and discordance in percent for comparison of PPI with TQH index related to classification of subjects into oral hygiene categories.

From: Comparison of different plaque indices with regard to sensitivity and specificity for the quantification of plaque during orthodontic therapy

PPI

TQH Index

Very good

Good

Moderate

Insufficient

Very good

0.6

1.3

2.1

0.00

Good

0.1

2.3

25.0

2.6

Moderate

0.4

1.9

19.7

34.0

Insufficient

0.00

0.00

0.6

9.4

  1. Significant values are in bold.
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