Table 5.

Estimated threshold score for discriminating between feeling better and feeling the same for the PHQ9 BDI-II and GAD-7 scales according to baseline severity and related ROC parameters

Instrument Scale	Severity	Threshold score	Threshold as % of baseline	95% change as % of baseline	Spec(1)	Sens(2)	AUC(3) Mean	(2.5%	97.5%)
PHQ9	≤11	−2.0	48.2	(65.1 37.1)	0.78	0.35	0.57	(0.54	0.60)
	12–19	−1.7	21.3	(27.9 16.7)	0.59	0.51	0.57	(0.53	0.62)
	20+	−2.4	19.7	(24.2 16.4)	0.63	0.52	0.61	(0.58	0.64)
BDI	≤11	−5.0	51.7	(66.6 41.6)	0.80	0.36	0.59	(0.55	0.63)
	12–19	−3.5	23.8	(30.9 18.6)	0.65	0.50	0.60	(0.55	0.65)
	20+	−4.4	19.7	(23.4 16.9)	0.65	0.51	0.61	(0.58	0.65)
GAD-7	≤11	−2.2	72.1	(97.3 54.8)	0.78	0.32	0.55	(0.53	0.59)
	12–19	−1.5	26.7	(36.2 20.7)	0.51	0.62	0.59	(0.55	0.64)
	20+	−0.8	8.9	(10.9 7.3)	0.55	0.54	0.57	(0.54	0.59)

⁽¹⁾Probability (improvements/reductions smaller than MCID when feeling the same).

⁽²⁾Probability (improvements/reductions larger than MCID when feeling better).

⁽³⁾Probability the improvement (reduction) in scores for a randomly chosen patient drawn from those reporting feeling the same is smaller than for a randomly chosen person drawn from those reporting feeling better.