Table 1.

Demographics of Subjects by Supplement Group

	Placebo				CMC				Gum Arabic				Psyllium
	ITTA (n=49)		PPA (n=47)		ITTA (n=53)		PPA (n=47)		ITTA (n=50)		PPA (n=49)		ITTA (n=54)		PPA (n=46)
	Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD
Age (years)	59	14	60	14	60	13	59	13	55	14	55	15	59	15	60	14
Body mass index	29	6	29	6	31	7	31	6	29	8	29	7	30	8	30	8
	n	%	n	%	n	%	n	%	n	%	n	%	n	%	n	%
Female	32	65	31	66	39	74	35	75	37	77	38	79	44	85	41	89
Racea and Ethnicity
White	44	90	42	89	48	91	42	89	47	94	47	96	49	91	43	94
Black	2	4	2	4	2	4	2	4	2	4	2	4	2	4	1	2
American Indian	0	0	0	0	1	2	1	2	0	0	0	0	1	2	0	0
Asian	1	2	1	4	0	0	0	0	1	2	0	0	1	2	1	2
More than 1 race	2	4	2	4	2	4	2	4	0	0	0	0	1	2	1	2
Hispanic	0	0	0	0	1	2	1	2	1	2	1	2	1	2	1	2
Married/Partnered b			30	64			34	72			38	78			26	57
Employedb			25	53			27	57			33	67			24	52
Education - highest levelb
Less than high school			1	2			0	0			2	4			1	2
High School graduate/some college			22	47			29	63			19	23			23	51
College graduate			24	51			17	37			27	56			21	47

Note. CMC = carboxymethylcellulose. ITTA= intent to treat analysis. PPA = per-protocol analysis. Age and body mass index are compared between groups using an analysis of variance; all categorical variables are compared using a chi-square test of association. All group comparisons > .05.

^aRace groups are mutually exclusive; some cells had too few observations for analysis.

^bPPA only.