. 2017 Aug 22;46(6):20170051. doi: 10.1259/dmfr.20170051

Table 2.

Pairs comparison using the Dunn–Bonferroni approach was used for post hoc testing, to evaluate the statistical differences of distortion in MRI evaluation between the four groups

craniofacial and cervical regions	Test statistic	Std. error	Std. test statistic	Sig.	Adj. sig.
Brain
Group 1 vs Group 2	−40.833	17.219	−2371	0.018	0.106
Group 1 vs Group 3	−86.833	17.219	−4985	0.000	0.000^a
Group 1 vs Group 4	−93.333	17.219	−5420	0.000	0.000^a
Group 2 vs Group 3	−45.000	17.219	−2613	0.009	0.054
Group 2 vs Group 4	−52.500	17.219	−3049	0.002	0.014^a
Group 3 vs Group 4	−7500	17.219	−0.436	0.663	1000
Paranasal sinuses
Group 1 vs Group 2	−292.500	19.947	−14.664	0.000	0.000^a
Group 1 vs Group 3	−323.750	19.947	−16.230	0.000	0.000^a
Group 1 vs Group 4	−338.750	19.947	−16.982	0.000	0.000^a
Group 2 vs Group 3	−31.250	19.947	−1567	0.117	0.703
Group 2 vs Group 4	−46.250	19.947	−2319	0.020	0.122
Group 3 vs Group 4	15.000	19.947	0.752	0.452	1000
Head and neck
Group 1 vs Group 2	−248.571	17.970	−13.833	0.000	0.000^a
Group 1 vs Group 3	−255.714	17.970	−14.230	0.000	0.000^a
Group 1 vs Group 4	−318.571	17.970	−17.728	0.000	0.000^a
Group 2 vs Group 3	−7143	17.970	−0.397	0.691	1000
Group 2 vs Group 4	−70.000	17.970	−3895	0.000	0.001^a
Group 3 vs Group 4	−62.867	17.970	−3498	0.000	0.003^a
Cervical region
Group 1 vs Group 2	−406.154	23.933	−16.971	0.000	0.000^a
Group 1 vs Group 3	−451.538	23.933	−18.867	0.000	0.000^a
Group 1 vs Group 4	−462.308	23.933	−19.317	0.000	0.000^a
Group 2 vs Group 3	45.385	23.933	1896	0.058	0.347
Group 2 vs Group 4	−56.154	23.933	−2346	0.019	0.114
Group 3 vs Group 4	−10.769	23.933	−0.450	0.653	1000
Cervical vertebrae
Group 1 vs Group 2	−257.143	16.852	−15.259	0.000	0.000^a
Group 1 vs Group 3	−291.429	16.852	−17.294	0.000	0.000^a
Group 1 vs Group 4	−291.429	16.852	−17.294	0.000	0.000^a
Group 2 vs Group 3	−34.286	16.852	−2035	0.042	0.251
Group 2 vs Group 4	−34.286	16.852	−2035	0.042	0.251
Group 3 vs Group 4	0.000	16.852	0.000	1000	1000

adj., adjusted; Group 1, control group; Group 2, stainless steel brackets without archwires; Group 3, stainless steel brackets and nickel-titanium archwires; Group 4, stainless steel brackets and stainless steel archwires; sig., significance; std., standard.

Each row tests the null hypothesis that the two group distributions are the same.

Asymptotic significances (two-sided tests) are displayed.

^{^a}

The significance level is 0.05.