Page 154 - Demo

Chapter 8152According to the Wilcoxon signed rank test, the mean OHIP score was still higher 4 weeks after surgery compared to baseline (P = .002) but lower at 6 months and 1 year compared to baseline (P = .000; Table 4). The statistical analysis of the changes in the total OHIP score over time (Figure 1) indicates that the OHRQoL decreases sharply immediately 1 day after surgery, and then improves slowly but is still lower than the baseline at 4 weeks. At 6 months, the OHRQoL was better than before surgery and continues to improve for at least 1 year.When the change in mean OHIP-14 score was examined per question after at least 1 year (T10) compared to baseline (T0), the Wilcoxon signed rank test showed a significant reduction for all questions except question 14 (Table 5). Question 14, which concerns inability to function, had a mean score of 0.4 at the baseline. This low score indicates that patients do not or hardly ever experience problems with function before surgery. The Kruskal Wallis test was used to assess the difference in the mean OHIP score across the different types of surgery and indications for surgery at a single time point (P > .05). We found no significant difference in the mean OHIP score between the four types of surgeries (Table 6) and between the two indications for surgery (class II vs. class III; Table 7) at any single time point. Class I with anterior open bite was not analyzed because only one patient had this deformity. Two-way ANOVA test was used to assess the average difference between the types of surgeries and types of deformities across four time points. No significant difference was found in the mean OHIP scores between the different types of surgeries over time (P = .783) and all time points together (P = .305). There was also no significant difference between class II and class III patients over time (P = .905) and all time points together (P = .860).