Table 3. Role of family history of RAS, diabetes, smoking and cessation of smoking among individuals who were affected with RAS in the past six months.

Family history of RAS	Affected by RAS in the past six months								X 2	P value
	Yes		No		Not applicable		Total
	N	%	N	%	N	%	N	%
Yes	190	59.0	51	18.5	13	15.4	254	37.2	123.33	≤ 0.001
No	132	39.7	224	81.4	71	84.5	427	62.7
Total	322	100.0	275	100.0	84	100.0	681	100.0
Diabetes	Affected by RAS in the past six months								X 2	P value
	Yes		No		Not applicable		Total
	N	%	N	%	N	%	N	%	31.442	≤ 0.001
Yes	24	7.4	3	1.0	1	1.1	28	4.1
No	298	92.5	272	98.9	83	98.8	653	95.8
Total	322	100.0	275	100.0	84	100.0	681	100.0
Smokers	Affected by RAS in the past six months
	Yes		No		Not applicable		Total		X 2	P value
	N	%	N	%	N	%	N	%	40.253	≤ 0.001
Yes	118	36.6	46	16.7	12	14.2	176	25.8
No	204	63.3	229	83.2	72	85.7	505	74.1
Total	322	100.0	275	100.0	84	100.0	681	100.0
Smoking Cessation	Affected by RAS in the past six months
	Yes		No		Not applicable		Total		X 2	P value
	N	%	N	%	N	%	N	%	96.14	≤ 0.001
Yes	111	34.4	29	10.5	2	2.3	142	20.8
No	13	4.0	35	12.7	4	4.7	52	7.6
Not Applicable	198	6.1	211	76.7	78	92.8	487	71.5
Total	322	100.0	275	100.0	84	100.0	681	100.0