Statistical analysis
bleeding, swelling
REGRESSION, BLEEDING, COMPLICATIONS
Demographic and clinical parameters and scales have been summarized using classic descriptive statistics. A multiple linear regression with stepwise selection was fitted for the entire study population to evaluate the relationship of OHIP scale (analyzed as total OHIP-14 score and score of 7 OHIP-14 subdomains) and VAS scale and the following variables: sex (male/female), age (<50/>50), smoking (no/yes), employment (public employee/private employee/retired/student/unemployed), surgeon experience (expert/resident), duration of surgery (<60 min/>60 min and <120 min/>120 min), number of surgical assistants (one/two/three or more), execution of intraoral pictures (no/yes), arch location (maxilla/mandible), site location (posterior/anterior/both), number of teeth involved (singular/multiple), flap involvement (vestibular/palatal/both), flap extension (<3 teeth/>3 teeth), presence of releasing incisions (yes/no), palatal graft harvest (yes/no) and site (premolar/molar/mixed/tuber), and presence of periodontal dressing (yes/no). A linear model was fitted to evaluate any relationship between analgesic consumption and OHIP and VAS records.Post-surgical complications (bleeding, swelling, eating discomfort, speech discomfort) were analyzed as dichotomous (yes/no), numeric (duration in days), and ordinal (on the basis of the likert scale) variables. Non-parametric tests (Chi-square analysis and Kruskall-Wallis test) were used to evaluate any significant between-group differences. A multiple logistic regression with stepwise selection was used to evaluate the relationship between post-surgical complications and the previously described variables. 