. Author manuscript; available in PMC: 2019 Aug 1.

Published in final edited form as: Arch Phys Med Rehabil. 2018 Apr 3;99(8):1533–1539.e2. doi: 10.1016/j.apmr.2018.02.016

Table 4.

Proportions with persistent, disabling back pain at follow-up, by STarT Back risk group, in specific subgroups^*

	RMDQ ≥7 at 6 months in older adults (age ≥ 65 years) n=414			RMDQ ≥7 at 6 months in acute back pain (< 1 month) n=183			RMDQ ≥7 at 6 months in those with recent improvement n=268
	n/n (proportion)	95% CI for proportion^a	p-value^b	n/n (proportion)	95% CI for proportion^a	p-value^b	n/n (proportion)	95% CI for proportion^a	p-value^b
STarT Back risk group (at baseline)
Low	44/165 (26.7%)	20.1%–34.1%	<0.0001	12/87 (13.8%)	7.3%–22.9%	<0.0001	27/168 (16.1%)	10.9%–22.5%	<0.0001
Medium	116/164 70.7%	63.1%–77.6%		33/65 (50.8%)	38.1%–63.4%		35/83 (42.2%)	31.4%–53.5%
High	67/85 78.8%	68.6%–86.9 %		17/31 (54.8%)	36.0%–72.7%		12/18 (66.7%)	41.0%–86.7%
	n/n_d (proportion)	proportion (95% CI)^a	p-value^b	n/n_d	proportion (95% CI)^a	p-value^b	n/n_d	proportion (95% CI)^a	p-value^b
STarT Back risk group (at baseline)
Low	44/165	26.7% (20.1%–34.1%)	<0.0001	12/87	13.8% (7.3%–22.9%)	<0.0001	27/168	16.1% (10.9%–22.5%)	<0.0001
Medium	116/164	70.7% (63.1%–77.6%)		33/65	50.8% (38.1%–63.4%)		35/83	42.2% (31.4%–53.5%)
High	67/85	78.8% (68.6%–86.9%)		17/31	54.8% (36.0%–72.7%)		12/18	66.7% (41.0%–86.7%)

RMDQ= Roland-Morris Disability Questionnaire, MATCH= Matching Appropriate Treatments to Consumers Healthcare needs trial, US=United States, UK=United Kingdom

Persistent, disabling back pain is defined as RMDQ ≥7 at 6 months

95% CIs for binomial proportions using Clopper-Pearson method

p-for trend