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Table. 4.

Outcomes of the AMW and dental expansion

Variable Author N Mean SD Combined
measurements
AMW Clement et al.20 (2017) 10 6.50 1.51
Lim et al.15 (2017) 24 2.60 0.85
Nguyen et al.28 (2021) 20 4.19 0.67
de Oliveira et al.24 (2021) 17 3.86 1.20
ICW Calil et al.13 (2021) 16 3.04 2.03
Clement et al.20 (2017) 10 5.83 1.32
Lim et al.15 (2017) 24 3.02 1.25
IPMW Calil et al.13 (2021) 32 3.63 2.14 1st/2nd PM*
Clement et al.20 (2017) 20 5.50 1.52 1st/2nd PM*
Lim et al.15 (2017) 48 5.87 1.26 1st/2nd PM*
de Oliveira et al.29 (2021) 17 5.21 2.25
Park et al.29 (2017) 14 5.50 1.40
IMW Calil et al.13 (2021) 16 6.37 1.72
Clement et al.20 (2017) 10 7.33 1.96
Jesus et al.22 (2021) 12 5.82 2.03
Li et al.11 (2020) 48 6.95 1.25 3 groups*
Lim et al.15 (2017) 24 5.63 1.90
Moon et al.27 (2020) 24 4.91 1.50
Ngan et al.18 (2018) 8 6.26 1.31
de Oliveira et al.24 (2021) 17 5.25 2.34
Park et al.29 (2017) 14 5.40 1.70

N, sample size; SD, standard deviation; AMW, alveolar molar width; ICW, inter-canine width; IPMW, inter-premolar width; IMW, inter-molar width; PM, premolar.

*Combined mean and SD from multiple groups using an online calculator https://www.statstodo.com/CombineMeansSDs.php

Korean J Orthod 2022;52:182~200 https://doi.org/10.4041/kjod21.256
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