Table 1. List of features used for the study.

Parameter	Description	Index/Categories
Age	Participant age	Number
Education	Level of education	Elementary School Secondary School Higher education
PIa	Number of tooth surfaces in % with dental plaque of the total number of surfaces	Percentage
PPDb 4mm	The number of PPD 4 mm in % of the total number of surfaces	Percentage
Use of dental hygiene tools for approximal cleaning	How often do you use approximal dental hygiene tools?	Rarely/never Once a week Daily Several times daily
Gender	Gender	Male, female
A feeling of dry mouth	Do you experience a sensation of dry mouth?	Yes, often Yes sometimes No never
Number of teeth	Number of teeth	Number
PPD 5mm	The number of PPD 5 mm in % of the total number of surfaces	Percentage
Mirror test	Mirror test	Glides easily Sliding Getting stuck
BOPc	The number of surfaces with BOP in % of the total number of surfaces.	Percentage
PPD≥6mm	The number of PPD ≥ 6 mm in % of the total number of surfaces	Percentage
Mandibular denture	Mandibular denture	Yes, No
Maxillary denture	Maxillary denture	Yes, No
Mandibular partial denture	Mandibular partial denture	Yes, No
Maxillary partial denture	Maxillary partial denture	Yes, No

^aPI: Plaque Index.

^bPPD: probing pocket depth.

^cBOP: bleeding on probing.