Table 1

Conversion table from PHQ-9 to EQ-5D total and change scores

Total scores			Change scores
PHQ-9	EQ-5D pretreatment	EQ-5D post-treatment	PHQ-9	EQ-5D
0	–	1.00	−25	0.900
1	1.00	1.00	−24	0.850
2	1.00	1.00	−23	0.850
3	1.00	0.91	−22	0.742
4	1.00	0.89	−21	0.708
5	1.00	0.88	−20	0.683
6	0.91	0.85	−19	0.675
7	0.89	0.84	−18	0.643
8	0.88	0.81	−17	0.632
9	0.85	0.80	−16	0.609
10	0.84	0.77	−15	0.575
11	0.83	0.75	−14	0.532
12	0.80	0.72	−13	0.454
13	0.77	0.72	−12	0.401
14	0.77	0.69	−11	0.319
15	0.73	0.68	−10	0.238
16	0.72	0.65	−9	0.196
17	0.69	0.62	−8	0.143
18	0.69	0.55	−7	0.094
19	0.65	0.38	−6	0.047
20	0.57	0.36	−5	0.031
21	0.41	0.29	−4	0.016
22	0.34	0.24	−3	0.002
23	0.27	0.17	−2	−0.013
24	0.23	0.12	−1	−0.026
25	0.17	0.02	0	−0.038
26	0.10	–	1	−0.047
27	0.04	–	2	−0.070
			3	−0.105
			4	−0.130
			5	−0.150
			6	−0.221
			7	−0.309
			8	−0.379
			9	−0.421
			10	−0.466
			11	−0.506
			12	−0.541
			13	−0.573
			14	−0.635
			15	−0.750
			16	−0.950
			17	−1.200

EQ-5D, Euro-Qol Five Dimensions; PHQ-9, Patient Health Questionnaire-9.