Prognostic ability of the German version of the STarT Back tool: analysis of 12-month follow-up data from a randomized controlled trial

Table 6 Correlation coefficients

		CPGS-DS	PHQ-4	SF-12 Physical Health	SF-12 Mental Health
START-G total score	rho	0.70	0.53	−0.65	−0.42
START-G sub-score	rho	0.61	0.58	−0.51	−0.51

Rho Spearman’s rho, CPGS Chronic Pain Grade Scale, DS disability score, STarT-G German version of the STarT-Back Tool, PHQ-4 Patient Health Questionnaire (4 items)
n = 294, all correlations are significant; p < 0.001 in each case (two-tailed)

ISSN: 1471-2474