Caroliene Meijndert

28 Chapter 2 Table 2. Clinical variables. Median, first and third inter quartile ranges of Plaque index (scores 0-3), Bleeding index (scores 0-3), and Gingiva index (scores 0-3) at T 1, T 12 and T 120 of treatment group Chin bone, Chin bone + Bio-Gide® and Bio-Oss® + Bio-Gide®. Chin bone (gr1) Chin bone + Bio- Gide® (gr2) Bio-Oss® + Bio- Gide® (gr3) Significance level between groups* Total of the groups T 1 n=31 n=31 n=29 n=91 Plaque index 1 [0;1] 0 [0;1] 0 [0;1] p overall = 0.02 gr1-gr2 p=0.02 gr1-gr3 p=0.01 0 [0;1] Bleeding index 1 [0;2] 1 [1;2] 2 [1;2] p overall = 0.21 1 [1;2] Gingiva index 0 [0;0] 0 [0;0] 0 [0;1] p overall = 0.81 0 [0;1] T 12 n=31 n=31 n=29 n=91 Plaque index 1 [0;1] 0 [0;1] 0 [0;1] p overall  = 0.16 0 [0;1] Bleeding index 2 [1;2] 2 [1;2] 2 [1;2] p overall  = 0.22 2 [1;2] Gingiva index 0 [0;1] 0 [0;1] 0 [0;1] p overall  = 0.99 0 [0;1] T 120 n=29 n=24 n=19 n=72 Plaque index 0 [0;0] 0 [0;1] 0 [0;1] p overall  = 0.77 0 [0;0.8] Bleeding index 1 [0;2] 1 [0;2] 1 [0;2] p overall  = 0.67 1 [0;2] Gingiva index 0 [0;0.5] 0 [0;0] 0 [0;0] p overall  = 0.31 0 [0;0] * Overall between-group comparison was calculated using the Kruskal-Wallis test. If statistical significance was found, the Mann–Whitney U tests was applied to relate an observed significant difference to a specific group.