Multivariate analysis of oral mucosal ulcers during orthodontic treatment

Table 2 Assignment of values to the variables

Variable	Assigned values
Sex	Male = 1; female = 2
Smoking history	No = 0; yes = 1
Drinking history	No = 0; yes = 1
Tooth brushing frequency	≤ 1 time per day = 0; > 1 time per day = 1
Toothbrush hardness	Soft = 0; hard = 1
Dietary preference for meat	No = 0; yes =1
Dietary temperature	Warm = 0; hot =1
Treatment course	≤ 1 year = 0; > 1 year = 1
Tooth position	Non-anterior tooth region = 0; anterior tooth region = 1
Disease type	Dental caries = 1; dentofacial deformity = 2; periodontal disease =3
Orthodontic appliance type	Straight-wire bracket = 1; conventional straight-wire = 2
Recurrence	Without = 0; with = 1