Table 7.

Association between duration of different non-nutritive sucking habits and primary dental relationships in vertical dimension (n = 851)

	Anterior openbite			Anterior overbite
	p-value	Anterior openbite vs non-anterior openbite		p-value	Overbite ≥ ½ vs overbite < ½
		OR	95% CI		OR	95% CI
Duration of daily pacifier use	0.000*			0.045*
> 1 year		15.171	5.298–43.446		0.577	0.374–0.890
< 1 year		0.000	0.000–0.000		0.881	0.302–2.570
Never		1	–		1	–
Duration of daily thumb/digit sucking	0.006*			0.122
> 1 year		6.383	1.689–24.120		0.631	0.352–1.131
Never		1	–		1	–

OR odds ratio, CI confidence interval

^a Adjusted for background information (age and gender) and duration of pure breastfeeding

* p < 0.05

Boldface data are variables with p < 0.05 or OR (95%CI) < 1

The group for < 1 year of daily thumb/digit sucking was excluded since the number of subjects were not sufficient to perform the test