| |
Groups
|
Comparison among groups
|
|---|
| |
Treated group
|
Children with a lateral cross-bite
|
Children without a lateral cross-bite
|
Adolescents with a normal occlusion
|
p value
|
|---|
|
n = 20
|
n = 20
|
n = 20
|
n = 20
| |
|---|
|
Mean age (SD), years
|
9.8(1.3)
|
9.0(0.9)
|
9.2(1.1)
|
14.3(2.4)
| |
|
Inter-canine width
| | | | | |
|
mean (SD), mm
|
32.2(2.0)
|
30.3(3.1)
|
31.8(2.0)
|
-
|
0.0353*
|
|
95 % CI
|
31.3 to 33.1
|
28.8 to 31.7
|
30.9 to 32.7
| | |
|
Inter-molar width
| | | | | |
|
mean (SD), mm
|
49.6(2.3)
|
44.5(2.4)
|
47.9(2.9)
|
50.6(2.8)
|
<0.001†
|
|
95 % CI
|
48.5 to 50.6
|
43.3 to 45.6
|
46.5 to 49.2
|
49.4 to 52.1
| |
|
Inter-molar depth
| | | | | |
|
mean (SD), mm
|
29.8(1.7)
|
31.8(2.2)
|
32.1(2.0)
|
29.0(1.6)
| |
|
95 % CI
|
29.0 to 30.6
|
30.8 to 32.9
|
31.2 to 33.0
|
28.3 to 29.8
|
<0.001‡
|
|
Irregularity index
| | | | | |
|
median (Iqr)§, mm
|
2.4(1.4)
|
3.2(2.9)
|
4.0(4.0)
|
-
|
0.0094‡
|
- *One-way ANOVA (F
(2,57) = 3.55; power of the test = 98 %; rho = 0). Significant pair differences (Bonferroni test): treated group vs children with a lateral cross-bite (p = 0.042). †One-way ANOVA (F
(3,76) = 21.60; power of the test = 100 %; rho = 0). Significant pair differences (Bonferroni test): treated group vs children with a lateral cross-bite (p < 0.001) and adolescents with a normal occlusion vs both children with a lateral cross-bite (p < 0.001) and children without a lateral cross-bite (p = 0.005). ‡One-way ANOVA (F
(3,76) = 12.86; power of the test = 99 %; rho = 0). Significant pair differences (Bonferroni test): treated group vs both children with a lateral cross-bite (p = 0.006) and children without a lateral cross-bite (p = 0.001); adolescents with a normal occlusion vs both children with a lateral cross-bite (p < 0.001) and children without a lateral cross-bite (p < 0.001). §Iqr is interquartile range. ǂKruskal-Wallis equality-of-populations rank test. Significant pair differences (two-sample Wilcoxon rank-sum test): treated patients vs children with a lateral cross-bite (p = 0.0094) and children without a lateral cross-bite (p = 0.0080)
