Chronic Periodontitis Case Definitions and Confounders in Periodontal Research: A Systematic Assessment

Table 1

Frequency and percentage of different chronic periodontitis case definitions.

Method	Number of studies(%)
	N=351
Single criteria
CAL	54(15.4)
Radiograph	19(5.4)
PD	110(31.3)
ICD	1(0.3)
Combined criteria
PD+CAL	121(34.5)
Radiograph + PD	5(1.4)
CAL + furcation	1(0.3)
CAL + radiograph	4(1.1)
PD+CAL+BOP	21(6.0)
PD+BOP	7(2.0)
Edema +BOP +PD+ recession +mobility	1(0.3)
PD+ CAL+ Radiograph	4(1.1)
PD+ Furcation	1(0.3)
PD+ Radiograph +BOP	2(0.6)

CAL: clinical attachment level, PD: probing depth, and BOP: bleeding on probing.