Table 1.

General Characteristics of Cases and Controls

Characteristics	Cases No.	%	Controls No.	%	p valuea
Age gr. (yrs)					0.981
≤ 29	10	3.9	11	4.3
30-34	30	11.7	28	10.9
35-39	63	24.5	61	23.7
40-44	154	59.9	157	61.1
Mean (SD)	39.20 (4.39)		39.30 (4.41)
Min-Max	25-44		25-44
Marital status					0.07
Single	68	26.5	84	32.7
Married	159	61.8	156	60.7
Widowed/Divorced	30	11.7	17	6.6
Education					0.068
No formal education	10	3.9	8	3.1
Primary school	67	26.1	52	20.2
Secondary school	78	30.3	65	25.3
Higher education	102	39.7	132	51.4
Religion					0.689
Buddhism	248	96.5	247	96.1
Islam	7	2.7	6	2.3
Christianity	2	0.8	4	1.6
Residence					1
North	1	0.4	1	0.4
Northeast	11	4.3	11	4.3
Central	176	68.5	176	68.5
East	16	6.2	16	6.2
West	48	18.7	48	18.7
South	5	1.9	5	1.9
Occupation					0.668
Office employee	92	35.8	87	33.8
Entrepreneur	77	30	85	33.1
Government officer	73	28.4	75	29.2
Agriculture	15	5.8	10	3.9
Monthly family income (baht)					0.066
< 10,000	38	14.8	34	13.2
10,000-15,000	52	20.2	48	18.7
15,001-30,000	138	53.7	124	48.2
>30,000	29	11.3	51	19.9
Mean(SD)	22,740.08 (9,311.92)		24,174.32 (13,541.38)
Min-Max	7,000-70,000		7,800-95,000

^achi-square test