Patients with adolescent idiopathic scoliosis perceive positive improvements regardless of change in the Cobb angle – Results from a randomized controlled trial comparing a 6-month Schroth intervention added to standard care and standard care alone. SOSORT 2018 Award winner

Table 2 Numbers of participants who improved or not their LC by more than 1° and reporting or not perceived improvement of GRC ≥ + 2 overall and in each therapy group

	Overall N = 40 (%)	Predictive values of the test, % (95% CI)	Schroth exercises + Standard of care, n = 20	Standard of care, n = 20
True positive: Improved based on GRC ≥ 2 and LC change > MID of 1⁰ (n, %)	12 (30%)	67 (41–86)	12 (60%)	0 (0%)
True negative: Not improved based on GRC < 2 and LC change ≤ MID of 1⁰ (n, %)	16 (40%)	73 (49–88)	1 (5%)	15 (75%)
False positive: Improved based on GRC ≥ 2 but LC change ≤ MID of 1⁰ (n, %)	6 (15%)	33 (14–59)	5 (25%)	1 (5%)
False negative: Not improved based on GRC < 2 but LC change > MID of 1⁰ (n, %)	6 (15%)	27 (12–50)	2 (10%)	4 (20%)

GRC Global Rating of Change, LC Largest Curve, MID Minimum Important Difference, n number of participants, 95% CI 95% confidence interval

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