Table 4.

Correlation between depression assessment tools (all p < 0.0001)

Time	Assessment tool 1	Assessment tool 2	N	Kendall’s tau-b
Baseline	PHQ-9	BDI-II	14081	0.6294
3 months	R-SMS-DS	PHQ-9 Total	2202	0.5704
	R-SMS-DS	PHQ-9 item 1	2192	0.5279
	R-SMS-DS	PHQ-9 item 2	2202	0.5316
	R-SMS-DS	PHQ-9 item 3	2192	0.3967
	R-SMS-DS	PHQ-9 item 4	2192	0.4206
	R-SMS-DS	PHQ-9 item 5	2182	0.4319
	R-SMS-DS	PHQ-9 item 6	2192	0.5673
	R-SMS-DS	PHQ-9 item 7	2202	0.4213
	R-SMS-DS	PHQ-9 item 8	2192	0.3786
	R-SMS-DS	PHQ-9 item 9	2202	0.4166
12 months	PHQ-9	BDI-II	5483	0.6632

¹All patients screened at baseline.

²Patients in the SMS sub-study with text replies received within +/− 6 days of date of PHQ-9 completion.

³All patients in the ACUDep trial with response data.