Parameter Time N Mean SD Mean
difference
P-value
Plaque index Baseline 14 2.41 0.31 1.03 < 0.001a
9 months 14 1.38 0.15
Gingival index Baseline 14 2.37 0.41 0.98 < 0.001a
9 months 14 1.4 0.35

aStatistically significant at P < 0.001 (Student's paired t-test).
N = number of subjects; SD = standard deviation.