Table 2 Mean values and standard deviations of gingival index (GI) measurements, before the orthodontic treatment had started (0), and at every second month (1, 3, 5, 7, 9, 11, 13) during the treatment

0.815^a

0.862^a

1.014^a

0.962^a

1.166^a

0.841^a

0.962^a

0.975^a

0.33

0.184

0.189

0.260

0.172

0.157

0.126

0.106

0.160

0.123