*2.3. Statistical Analysis*

The data collected during the study were inserted into a database in Excel and the statistical analysis was performed with one of its applications (Stat). The data were standardized. A test unit was used in order to find the best criteria that could best evaluate the laser- treatment. For the analyses there was an intra-examiner agreement. In the first part we analysed the characteristics of the sample, while in the second phase we focused on the data during the treatment in order to obtain information regarding both the efficiency and the sustainability of the treatment.
