Table 3.

Association between severity of PD with severity of DR.

	Severity of Periodontal Disease			Total	Χ2	p Value
	Mild	Moderate	Severe
Group 1	5	48	2	55	225.301	<0.001
	9.1%	87.3%	3.6%	100.0%
Group 2	4	37	3	44
	9.1%	84.1%	6.8%	100.0%
Group 3	0	12	40	52
	0.0%	23.1%	76.9%	100.0%
Group 4	41	8	0	49
	83.7%	16.3%	0.0%	100.0%
Total	50	105	45	200
	25.0%	52.5%	22.5%	100.0%