Infection Risk Prediction Model for COVID-19 Based on an Analysis of the Settlement of Particles Generated during Dental Procedures in Dental Clinics

Table 3

Association of independent variables.

Independent variable	Condition of care	value
Division	With modular division between units	0.45
	Without modular division between units
Dental unit	1 (adequate ventilation)	0.08
	2 (inadequate ventilation)
Tooth	Anterior	0.06
	Posterior
Ventilation	Open	0.020^a
	Close
Distance	>78 cm	0.001^a
	<78 cm
Instrument	High-speed handpiece	0.001^a
	Pneumatic scaler
	Ultrasonic scaler
	Triple syringe
Filter paper location	Operator and patient	0.001^a
	Assistant
	Dental equipment
	Accessory surfaces
	Adjacent surfaces

^aStatistical association of independent variables ( < 0.05).