Table 1. Dentition features in the Arara-Iriri and Arara-Laranjal groups for deciduous, mixed and permanent dentition.

	Iriri Village				Laranjal Village
	Deciduous n = 8 (17.4%)	Mixed n = 15 (32.6%)	Permanent n = 23 (50%)	TOTAL n = 46 (100%)	Deciduous n = 34 (26.2%)	Mixed n = 38 (29.2%)	Permanent n = 58 (44.6%)	TOTAL n = 130 (100%)	PR p-value
Normal X Malocclusion								1.86***
Normal	5 (62.5%)	4 (26.7%)	8 (34.8%)	17 (37.0%)	28 (82.4%)	21 (55.3%)	37 (63.8%)	86 (66.2%)
Malocclusion	3 (37.5%)	11 (73.3%)	15 (65.2%)	29 (63.0%)	6 (17.6%)	17 (44.7%)	21 (36.2%)	44 (33.8%)
Malocclusion Classif.
Class I	1 (12.5%)	1 (6.7%)	2 (8.7%)	4 (8.7%)	3 (8.8%)	9 (23.7%)	11 (19.0%)	23 (17.7%)	0.58 ns
Class II	1 (12.5%)	4 (24.7%)	5 (21.7%)	10 (21.7%)	2 (5.9%)	7 (18.4%)	5 (8.6%)	14 (10.8%)	2.0*
Class III	1 (12.5%)	6 (40%)	8 (34.8%)	15 (32.6%)	1 (2.9%)	1 (2.6%)	5 (8.6%)	7 (5.4%)	6.1***
Malocclusion Type
Overbite	0 (0.0%)	0 (0.0%)	0 (0.0%)	0 (0.0%)	1 (2.9%)	4 (10.5%)	0 (0.0%)	5 (3.9%)	∞ ns
Open bite	1 (12.5%)	4 (26.7%)	9 (39.1%)	14 (23.9%)	2 (5.9%)	5 (13.2%)	8 (13.8%)	15 (11.5%)	2.64**
Overjet	1 (12.5%)	2 (13.3%)	3 (15.8%)	6 (14.3%)	1 (2.9%)	2 (5.2%)	2 (3.4%)	5 (3.9%)	3.39*
Anterior Crossbite	1 (12.5%)	7 (46.7%)	8 (34.8%)	16 (30.4%)	2 (5.9%)	3 (7.9%)	11 (19.0%)	16 (12.3%)	2.83***
Posterior Crossbite	1 (12.5%)	3 (20.0%)	1 (5.3%)	5 (11.9%)	1 (2.9%)	1 (2.6%)	1 (1.7%)	3 (2.3%)	4.71*
Midline deviation	NA	0 (0.0%)	6 (26.1%)	6 (15.8%)	NA	4 (10.5%)	9 (15.5%)	13 (13.6%)	1.17 ns
Crowding	NA	0 (0.0%)	0 (0.0%)	0 (0.0%)	NA	9 (23.7%)	11 (19.0%)	20 (20.8%)	∞ **
Spacing	NA	1 (6.7%)	0 (0.0%)	1 (2.6%)	NA	0 (0.0%)	0 (0.0%)	0 (0.0%)	∞ ns

PR = Prevalence Ratio.

^∞PR Not computed (zero)/p-value for NA = Not available (ns) = not significant;

^*P<.05;

^**P<.01;

^***P<.001.