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Table 2 Correlation between school grade and improvement ratio of PCR and PHP

From: Self-check with plaque disclosing solution improves oral hygiene in schoolchildren living in a children’s home

School grade Improvement ratio of PCR Improvement ratio of PHP
1 −0.028 0.067
1 0.068 0.64
3 0.48 0.48
4 0.32 0.46
4 0.11 0.0
4 0.57 0.26
5 1.00 1.00
6 0.22 0.57
6 0.83 0.67