Table 1.

Mean values of the Approximal Plaque Index (API) in both groups.

Group	API	n	M	SD	V	min	max	Q1	Me	Q3
Orthodontically treated group	API1	60	16.20	13.23	81.7%	0.00	50.00	7.50	13.00	24.00
	API2	60	23.57	16.33	69.3%	0.00	75.00	13.00	18.50	31.50
	API3	60	34.10	17.34	50.8%	0.00	88.00	23.00	33.00	43.00
Control group	API1	84	14.96	11.83	79.08%	0.00	83.00	7.00	13.00	20.00
	API2	84	12.63	13.92	110.2%	0.00	90.00	3.00	10.00	17.00
	API3	84	20.82	20.04	96.3%	0.00	97.00	7.00	13.00	27.00