Three dimensional quantitative study of soft tissue changes in nasolabial folds after orthodontic treatment in female adults

Table 4 Comparison of changes between non-extraction and extraction groups*

Measurement	t-value	Z-value	P-value
Nasolabial folds
NLF1L	− 3.771		0.000^ƚ
NLF2L	− 5.169		0.000^ƚ
NLF3L	− 5.216		0.000^ƚ
L′	− 4.602		0.000^ƚ
L′′	− 5.741		0.000^ƚ
NLF1R		− 3.396	0.001^ƚ,ǂ
NLF2R	− 4.506		0.000^ƚ,
NLF3R	− 4.757		0.000^ƚ
R′	− 3.277		0.002^ƚ
R′′	− 4.516		0.000^ƚ,
Lips
ChL		− 3.928	0.000^ƚ,ǂ
ChR		− 4.038	0.000^ƚ,ǂ
ULP	− 5.721		0.000^ƚ
LLP		− 4.883	0.000^ƚ,ǂ
Ls		− 3.745	0.000^ƚ,ǂ
Li		− 4.112	0.000^ƚ,ǂ
CphL		− 3.506	0.000^ƚ,ǂ
CphR		− 3.763	0.000^ƚ,ǂ
STM		− 5.507	0.000^ƚ,ǂ
Cheeks
CkL		− 1.927	0.054^ǂ
CkR		− 1.358	0.174^ǂ
BuL	− 0.536		0.595
BuR	− 0.285		0.777
Perioral soft tissues
TN		− 1.927	0.054^ǂ
A′	− 7.261		0.000^ƚ
B′		− 3.708	0.000^ƚ,ǂ
Pog′	0.663		0.510
Sn		− 1.781	0.075^ǂ
Me′		− 0.899	0.368^ǂ

^ƚSignificant difference between the non-extraction and extraction groups, P < 0.05; *If the data conformed to normal distribution and variances were uniform, an independent sample t-test was used; ^ǂIf the data did not conform to a normal distribution and uniform variances, a Mann-Whitney U test was used

ISSN: 1472-6831