Table 1.

Characteristics of respondents and nonrespondents.

Characteristics				Respondents (n=28)		Nonrespondents (n=18)		P valuea
DVD group, n				10		7		N/Ab
	Age (years)
		Mean (SD)	51.3 (16.1)		44.9 (13.9)		.73
		Range	29-77		26-66		N/A
	Sex, n (%)
		Male	1 (10.0)		1 (14.3)		N/A
		Female	9 (90.0)		6 (85.7)		N/A
	BMI (kg/m2), mean (SD)			22.4 (3.1)		22.1 (3.5)		.96
Website group, n				18		11		N/A
	Age (years)
		Mean (SD)	52.4 (10.4)		38.2 (14.1)		.02
		Range	25-69		20-57		N/A
	Sex, n (%)
		Male	2 (11.1)		1 (9.1)		N/A
		Female	16 (88.9)		10 (90.9)		N/A
	BMI (kg/m2), mean (SD)			22.0 (3.0)		24.0 (10.0)		.70

^aMann-Whitney U test.

^bN/A: not applicable.