Table 2.

Primary outcomes, back pain-specific and general pain-related function.

Primary outcome				Adjusted between-group differencea (95% CI)
			Complete case		P value	All case	P value
RDQ score (0-24)
	6 months		1.6 (0.3 to 2.8)		.02	1.2 (-0.09 to 2.5)	.07
	12 months		1.2 (-0.3 to 2.7)		.11	0.7 (-0.8 to 2.2)	.38
MOS pain-related functional interference score (0-100)
	6 months		3.6 (-0.51 to 7.7)		.09	2.5 (-1.5 to 6.5)	.23
	12 months		0.1 (-4.0 to 4.2)		.97	-1.4 (-5.4 to 2.5)	.48
Subgroup with RDQ scores ≥4 at baseline RDQ score (0-24)
	6 months		1.9 (0.5 to 3.3)		.01	1.7 (0.3 to 3.0)	.02
	12 months		1.1 (-0.6 to 2.7)		.20	0.8 (-0.8 to 2.4)	.34
MOS pain-related functional interference score (0-100)
	6 months		4.6 (-0.1 to 9.3)		.05	3.8 (-0.7 to 8.3)	.10
	12 months		-0.5 (-5.0 to 4.0)		.83	-1.5 (-5.8 to 2.8)	.49

^aAdjusted for baseline values and calculated as pain or function in enhanced usual care group minus Internet-mediated intervention group so that positive scores reflect greater improvement in the intervention group.