Effects of breast-feeding duration, bottle-feeding duration and non-nutritive sucking habits on the occlusal characteristics of primary dentition

Table 4 Non-nutritive sucking habits and occlusal characteristics

Characteristics	Pacifier sucking		Digit sucking
	Chi-square test	P	Chi-square test	P
Posterior crossbite	0.7416	0.3891	1.2050	0.2723
No maxillary space	0.0146	0.9038	0.9173	0.3382
Mesia step	0.1041	0.7470	0.0114	0.9151
Class IIcanine relationship	0.2657	0.6062	0.0036	0.9519
Overjet≧4 mm	6.6105	0.0101*	0.0305	0.8613
Absence of lower arch developmental space	4.3492	0.0370*	2.3139	0.1282
Anterior open bite	0.3012	0.5832	20.3337	0.0000*
Anterior crossbite	0.2477	0.6187	0.1574	0.6916

The chi-square test was used to analyze the associations between non-nutritive sucking and occlusal characteristics.
*Comparisons are significantly different, P < 0.05.

ISSN: 1471-2431