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Table 5 Correlation between space gain strategy and crowding in upper arch

From: Predictability of crowding resolution in clear aligner treatment

Δ Irregularity index

Δ 3-3

Δ 4-4

Δ 5-5

Δ 6-6

Δ Arch length

Δ IPR

Pearson's r

 − 0.41

 − 0.35

 − 0.21

 − 0.27

0.09

0.31

p value

0.01

0.03

0.19

0.12

0.58

0.06