Longitudinal study of habits leading to malocclusion development in childhood

BMC Oral Health

Table 3 Association between habits at 12, 18 and 30 months and malocclusions at 30 months after birth in children living in the southeast of Brazil

Habit	Months after birth	Overjet		Overbite		Open bite		Posterior crossbite
Habit	Months after birth	χ 2	p value	χ 2	p value	χ 2	p value	χ 2	p value
Pacifier sucking	12	22.8	*<0.0001	nc	0.058	12.9	*0.0003	0.7	0.538
	18	22.8	*<0.0001	nc	0.058	12.9	*0.0003	0.7	0.538
	30	26.9	*<0.0001	9.3	*0.002	17.1	*<0.0001	1.7	0.18
Finger sucking	12	nc	*0.028	nc	0.865	nc	*0.0008	1.4	0.4
	18	nc	*0.010	nc	0.745	nc	*0.003	nc	0.12
	30	nc	*0.017	nc	0.865	nc	*0.0008	nc	0.23
Nocturnal mouth breathing	12	nc	0.153	nc	0.715	2.4	0.219	nc	*0.012
	18	0.4	0.703	nc	0.716	1.6	0.337	nc	*0.005
	30	1.5	0.34	nc	0.6	1.7	0.308	4.3	0.07
Bottle feeding	12	nc	0.06	nc	0.4	0.9	0.32	4.9	*0.02
	18	nc	0.46	nc	0.63	0.3	0.58	1.1	0.29
	30	nc	0.61	nc	0.35	nc	0.73	4.2	*0.04
Breastfeeding	12	23.05	*<0.0001	3.07	0.07	14.17	*0.0002	2.7	0.09
	18	19.7	*<0.0001	nc	0.2	9.85	*0.001	1.7	0.19
	30	nc	*0.01	nc	0.91	nc	* 0.01	0.7	0.39

ISSN: 1472-6831