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Table 5 Mean difference (in mm) between the time points

From: A two-year comparative assessment of retention of arch width increases between modified vacuum-formed and Hawley retainers: a multi-center randomized clinical trial

Variable HR mVFR
ICW   
T1–T0  − 0.01  − 0.11
T2–T1  − 0.12  − 0.13
T3–T2  − 0.27  − 0.25
T4–T3 0.10 0.10
T4–T0  − 0.30  − 0.39
IPMW   
T1–T0  − 0.01  − 0.23
T2–T1  − 0.12  − 0.10
T3–T2  − 0.27  − 0.37
T4–T3 0.10  − 0.09
T4–T0  − 0.30  − 0.79
IFMW1   
T1–T0  − 0.01  − 0.20
T2–T1  − 0.12  − 0.14
T3–T2  − 0.27  − 0.08
T4–T3 0.10  − 0.07
T4–T0  − 0.30  − 0.49
IFMW2   
T1–T0  − 0.01  − 0.06
T2–T1  − 0.12  − 0.09
T3–T2  − 0.27  − 0.15
T4–T3 0.10 0.09
T4–T0  − 0.30  − 0.21
  1. HR indicates Hawley retainer; mVFR, modified vacuum-formed retainer; ICW, intercanine width; IPMW, interpremolar width; IFMW1, interfirst molar mesiobuccal cusp width-; IFMW2, interfirst molar distobuccal cusp width; T0, at debond; T1, 3-month retention; T2, 6-month retention; T3, 12-month retention; T4, 24-month retention