The adults had significantly lower plaque index ( 0.48 [ 0.13-0 .84 ] , P < 0.001 ) and gingival index ( 0.06 [ 0.01-0 .11 ] , P = 0.018 ) scores than did the teenagers , and the female subjects had significantly higher gingival index ( -0.06 [ -0.11 to -0.01 ] , P = 0.040 ) scores than did the male subjects .