Table 2.

The plaque index, gingival index, and gingival bleeding index before and after the use of chlorhexidine at baseline and at 21^st day

Parameter	Interval	Mean	SD	SEM	Mean rank	Z	P
PI	Before	1.77	0.21	0.04	15.50	−4.783	0.001**
	After	0.51	0.11	0.02
GI	Before	1.81	0.26	0.05		−4.782	0.001**
	After	0.62	0.13	0.02
GBI	Before	93.20	6.84	1.25		−4.784	0.001**
	After	33.53	6.56	1.2

Test applied: Wilcoxon signed-rank test; **P≤0.001 (highly significant). PI – Plaque index; GBI – Gingival bleeding index; GI – Gingival index; SD – Standard deviation; SEM – Standard error of mean; Z – Measurement of standard deviation; P – Probability value