Table 4.

Results of the multivariate linear regression for primary outcomes of interest.

Model		ß coefficient	SE	t test (df)	P value
Pain improvement
	(Constant)	.49	0.31	1.60 (5)	.11
	In clinic	−1.04	0.19	−5.36 (5)	<.001 a
	Program duration (days)	.01	0.002	3.32 (5)	.001 a
	Visit number (days per log-ins)	0	0.002	0.16 (5)	.87
	Age (years)	.01	0.003	2.64 (5)	.009 a
	Baseline pain (points)	−.67	0.03	−24.00 (5)	<.001 a
Oswestry Disability Index improvement
	(Constant)	2.74	1.92	1.43 (5)	.15
	In clinic	−3.01	1.31	−2.30 (5)	.02 a
	Program duration (days)	.03	0.01	2.40 (5)	.02 a
	Visit number (days/log-ins)	−.03	0.02	−1.48 (5)	.14
	Age (years)	.07	0.02	3.02 (5)	.003 a
	Baseline Oswestry Disability Index (points)	−.46	0.03	−18.17 (5)	<.001 a
Goals improvement
	(Constant)	6.40	0.43	14.82 (5)	<.001 a
	In clinic	−.52	0.28	−1.86 (5)	.06
	Program duration (days)	−.01	0.002	−2.12 (5)	.03 a
	Visit number (days per log-ins)	.01	0.004	1.54 (5)	.13
	Age (years)	−.01	0.005	−2.50 (5)	.01 a
	Baseline goals (points)	−.77	0.04	−20.97 (5)	<.001 a

^aItalics indicate significant difference between online and in clinic groups.