highly significantp < 0.0001
There was no statistically significant difference between the two groups one month after surgery (p = 0.124), but there were highly significant differences between the groups at two months (66.0 ± 28.7 vs. 40.4 ± 17.5, p < 0.0001), six months (80.0 ± 19.4 vs. 51.0 ± 18.2, p < 0.0001) and 12 months (87.3 ± 16.8 vs. 55.0 ± 33.2, p < 0.005) (Figure 3 A).