Lip closing force of Class III patients with mandibular prognathism: a case control study

Head & Face Medicine

Table 2 Levene’s test and student’s t -test of LCF

	Levene’s test		t-test for equality of means
	F	Sig.	t	df	Sig. (2-tailed)	Mean difference	Std. error difference	95% confidence interval of the difference
	F	Sig.	t	df	Sig. (2-tailed)	Mean difference	Std. error difference	Lower	Upper
MaxUL	17.233	.000	-.282	131	.778	-.041	.146	-.331	.248
AveLL	35.573	.000	-1.677	131	.096	-.281	.167	-.612	.050
MaxLL	1.196	.276	3.513	130.674	.001	.541	.154	.236	.845
AveLL	2.853	.094	5.204	128.774	.000	.681	.131	.422	.940

Max UL indicates maximum upper lip closing force; Ave UL, average upper lip closing force; Max LL, maximum lower lip closing force; Ave LL, average lower lip closing force;
The t-test result of MaxLL and AveLL were adjusted according to the Levene’s Test.

ISSN: 1746-160X