Table 2.

STarT Back Tool risk groups and 30% improvement in the Roland Morris Disability score

STarT Back cut-off	Low vs Medium/High			Low/Medium vs High
Follow-up	RR	95% CI	P-value	RR	95% CI	P-value
4 weeks	1.64	(1.26–2.15)	< 0.001	1.71	(1.18–2.49)	0.002
8 weeks	1.38	(1.13–1.70)	0.003	1.61	(1.20–2.15)	< 0.001
52 weeks	1.21	(1.02–1.43)	0.040	1.36	(1.08–1.72)	0.003

Note: Relative risk (RR) of not achieving a clinically relevant improvement in function (30% improvement in the Roland Morris Disability score). The higher RR comparing Low/Medium vs High is equivalent to more desirable functional outcomes for the ‘Low/Medium group’