Table 3. Prevalence of dietary supplement users by major category and sub-category by user category (%) (1,152 males and 1,107 females).

Category	Sub-category		User category†
			Any		Seldom		Weekly		Daily
			Males	Females	Males	Females	Males	Females	Males	Females
1. Vitamin			23.1	30.2*	6.2	6.8	6.9	7.2	10.0	16.2*
	Multivitamin		14.6	15.5	4.4	4.4	5.4	4.4	4.8	6.6
	Vitamin C		4.7	8.0*	1.1	1.4	1.5	2.1	2.1	4.6*
	Vitamin E		4.0	6.8*	0.7	1.3	0.5	1.0	2.8	4.5*
	Vitamin B2		2.0	2.8	0.8	1.1	0.4	0.5	0.9	1.2
	Vitamin B12		2.3	2.4	0.6	0.6	0	0.4*	1.7	1.4
	Vitamin D		0.3	2.8*	0	0.1	0	0.5*	0.3	2.2*
	Vitamin A		0.4	1.1*	0.1	0.2	0.1	0	0.2	0.9*
	Vitamin B1		0.5	0.8	0.2	0.1	0.2	0.2	0.2	0.5
	Pantothenic acid		0.2	0.8*	0	0.1	0.1	0.1	0.1	0.6*
	Vitamin B6		0.4	0.3	0.1	0	0	0	0.3	0.3
	Vitamin K		0.1	0.5	0	0	0	0	0.1	0.5
	Folate		0.1	0	0	0	0	0	0.1	0
2. Mineral			2.7	7.6*	0.8	1.4	0.4	2.1*	1.5	4.2*
	Calcium		1.7	5.2*	0.4	0.6	0.3	1.3*	1.0	3.3*
	Iron		0.2	2.4*	0.2	0.6	0	1.0*	0	0.7*
	Magnesium		0.4	0.5	0.1	0.2	0.1	0	0.2	0.3
	Other minerals		0.5	0.5	0.2	0.1	0.1	0	0.3	0.4
3. Fatty acid			1.0	1.2	0.1	0.3	0.1	0.2	0.7	0.8
4. Amino acid			1.1	1.5	0.1	0.4	0.4	0*	0.6	1.2
5. Dietary fiber			0.1	0.5	0	0.1	0	0	0.1	0.5
6. Drink type			27.0	24.8*	17.5	14.0*	7.4	8.0	2.2	2.9
7. Medicine			12.0	9.7	10.0	8.2	1.6	0.9	0.4	0.5
8. Others			18.3	26.9*	3.0	4.6*	4.1	6.0*	11.3	16.4*

† : Dietary supplement users were categorized into three user groups:

Seldom; seldom users those who reported any dietary supplement use once a year or more but less than once a week for the past 12 months.

Weekly; weekly uses those who reported any dietary supplement use once a week or more but less than once a day for the past 12 months.

Daily; daily users those who reported any dietary supplement use once a day or more for the past 12 months.

Any; combined three groups.

* : p<0.05 by Chi square test

No subject used niacin or biotin sub-category dietary supplement.