Table 5.

Univariable analyses of associations between website usage variables (categorized) per 30 days and reported weight change per 30 days^a in the final cohort (n=1258).

		Sample size	Coefficient	95% CI	P value
Log-in days per 30 days
	0 to <4	842	reference		Overall: <.001
	≥4	416	-3.18 kg	-4.69 kg to -1.67 kg	<.001
Weight entry days per 30 days
	0 to <4	1018	reference		Overall: <.001
	≥4	240	-5.09 kg	-6.89 kg to -3.29 kg	<.001
Food entry days per 30 days
	0	365	reference		Overall:.002
	1 to <4	684	1.04 kg	-0.59 kg to 2.68 kg	.21
	≥4	209	-2.49 kg	-4.68 kg to -0.30 kg	.03
Exercise entry days per 30 days
	0	581	reference		Overall: .021
	1 to <4	576	1.18 kg	-0.30 kg to 2.67 kg	.12
	≥4	101	-2.46 kg	-5.20 kg to 0.26 kg	.08
Exercise minutes per 30 days
	0	517	reference		Overall: .054
	1 to <120	556	1.43kg	-0.12 kg to 2.98 kg	.07
	≥ 120	185	-0.89kg	-3.06 kg to 1.28 kg	.42
SparkPoints per 30 days
	0	74	reference		Overall: .003
	1 to <20	546	5.35 kg	2.22 kg to 8.48 kg	<.001
	≥20	638	4.47 kg	1.37 kg to 7.58 kg	.005
Forum posts per 30 days
	0	967	reference		Overall: .24
	1 to <4	233	0.99 kg	-0.86 kg to 2.84 kg	.30
	≥4	58	-2.09 kg	-5.52 kg to 1.33 kg	.23
Friends
	0	711	reference		Overall: .55
	1	327	0.88kg	-0.81 kg to 2.57 kg	.31
	≥2	220	0.90 kg	-1.08 kg to 2.87 kg	.37

^a Analyses were adjusted for baseline BMI.