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Table 4 Independent samples T-test

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 Type of retainer Mean Mean difference 95% CI of the difference P value
Fitting mVFRs 7.08 1.24  − 0.526, 3.013 .160
HRs 5.84
Speech mVFRs 7.32 1.76  − 0.247, 3.759 .083
HRs 5.56
Appearance mVFRs 8.02 1.84 0.209, 3.460 .029*
HRs 6.18
Oral hygiene mVFRs 7.63 0.77  − 1.053, 2.606 .389
HRs 6.86
Durability mVFRs 7.05 0.25  − 1.700, 2.192 .797
HRs 6.80
Comfort mVFRs 7.69 1.63  − 0.261, 3.521 .088
HRs 6.06
Total mean additive score mVFRs 7.46 1.24  − 0.277, 2.772 .104
HRs 6.22
  1. mVFRs indicate modified vacuum-formed retainers; HRs, Hawley retainers; CI, confidence interval
  2. Level of significance set at 0.05. *Significant P values