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Table 4 Intragroup and intergroup comparison of the 7 dimensions and the total score of the OHIP-14

From: Mini Hyrax vs Hyrax expanders in the rapid palatal expansion in adolescents with posterior crossbite: a randomized controlled clinical trial

Dimensions OHIP 14 T0 Mean (SD) T1 Mean (SD) T2 Mean (SD) Statistical difference T0-T1-T2 T0 Mean (SD) T1 Mean (SD) T2 Mean (SD) Statistical difference T0–T1–T2 Statistical difference
Coef. (95% CI)
p value
Statistical difference
Coef. (95% CI)
p value
Mini Hyrax     Hyrax     Mini Hyrax x Hyrax
(T1 × T0)
Mini Hyrax x Hyrax
(T2 × T0)
FL 0.73 (1.22)a 2.53 (2.06)b 1.93 (1.28)ab 0.031* 0.73 (1.10)a 2.60 (1.18)b 2.13 (1.88)ab 0.010* 0.06 (− 1.21–1.34) 0.916** 0.20 (− 1.02–1.42)
0.740***
FD 2.47 (1.80)a 3.93 (2.15)b 2.87 (2.03)ab 0.048* 1.80 (1.14)a 3.87 (1.76)b 2.40 (1.50)a 0.001* 0.13 (− 1.36–1.63)
0.859**
− 0.50 (− 1.90–0.88)
0.463***
PD 3.87 (2.41)a 2.40 (2.61)a 1.60 (2.26)a 0.088* 2.53 (2.16)a 2.47 (2.13)a 2.00 (1.55)a 0.646* 0.26 (− 1.61–2.14)
0.774**
0.32 (− 1.22–1.68)
0.673***
FD 0.73 (1.16)a 0.87 (1.06)a 0.47 (0.83)a 0.391* 0.47 (0.74)a 1.93 (2.05)a 1.00 (1.36)a 0.065* 1.07 (− 0.18–2.33)
0.091**
0.59 (− 0.26–1.44)
0.167***
PD 3.13 (2.29)a 2.20 (1.74)a 1.53 (1.76)a 0.196* 1.27 (1.38)a 1.47 (1.76)a 0.67 (0.72)a 0.051* − 0.94 (− 2.43–0.54)
0.206**
− 1.15 (− 2.28–0.03)
0.052***
SD 1.60 (1.84)ab 1.20 (1.74)a 0.53 (0.99)b 0.038* 0.60 (1.12)ab 0.67 (1.17)a 0.13 (0.35)b 0.009* − 0.31 (− 1.48–0.85)
0.583**
− 0.32 (− 0.91–0.26)
0.272***
HC 0.80 (1.14)a 0.40 (0.82)ab 0.00 (0.00)b 0.030* 0.40 (0.73)a 0.40 (0.82)ab 0.07 (0.25)b 0.049* 0.02 (− 0.61–0.67)
0.930**
0.06 (− 0.08–0.20)
0.390***
SCO 13.33 (8.04)ab 13.53 (7.12)a 8.93 (5.67)b 0.026* 7.80 (6.80)ab 13.40 (8.49)a 8.33 (5.86)b 0.040* − 0.08 (− 6.49–6.32)
0.978**
− 0.70 (− 5.41–4.01)
0.762***
  1. T0 pretreatment, T1 14th day of the appliance activation, T2 after 6 months retention period, SD standard deviation, FL functional limitation, FD physical discomfort, PD psychological discomfort, FD physical disability, PD psychological disability, SD social disability, HC handicaps, SCO total score
  2. *ANOVA test for repeated measures, Level of significance p < 0.05
  3. For comparison of pairs T0 X T1, T0 X T2, T1 X T2 in Mini-Hyrax group and Hyrax group, paired t test was employed. Different letters indicate significant difference. Bonferroni correction. Level of significance p < 0.016
  4. Coef coefficient
  5. **Regression analysis assessing differences between Mini-Hyrax and Hyrax groups of the OHIP-14 scores at T1, controlling for the OHIP-14 scores at T0. Level of significance p < 0.05
  6. ***Regression analysis assessing differences between Mini-Hyrax and Hyrax groups of the OHIP-14 scores at T2, controlling for the OHIP-14 scores at T0. Level of significance p < 0.05