Table 3.

API ranges—assessment for the group (A) and group (C) (% of cases).

	Oral hygiene assessment (interproximal spaces)						Friedman ANOVA test (P)	Wilcoxon rank test (P)
	1st		2nd		3rd
Group (C)	Optimal	25.0%	Optimal	12.5%	Optimal	50.0%	0.149	(1) : (2) n/a (2) : (3) n/a (1) : (3) n/a
	Quite good	12.5%	Quite good	50%	Quite good	12.5%
	Average	50%	Average	37.5%	Average	37.5%
	Bad	12.5%	Bad	0.0%	Bad	0.0%
Group (A)	Optimal	25.0%	Optimal	50.0%	Optimal	87.5%	0.005*	(1) : (2) = 0.201 (2) : (3) = 0.022*  (1) : (3) = 0.456
	Quite good	12.5%	Quite good	37.5%	Quite good	12.5%
	Average	62.5%%	Average	12.5%	Average	0.00%
	Bad	0.0%	Bad	0.00%	Bad	0.00%
Mann-Whitney U test (P)	0.472		0.109		0.183		—	—

 *Statistically significant P value < 0.05.