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Table 4 Correlation between depression assessment tools (all p < 0.0001)

From: Feasibility, acceptability and validity of SMS text messaging for measuring change in depression during a randomised controlled trial

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

  1. 1All patients screened at baseline.
  2. 2Patients in the SMS sub-study with text replies received within +/− 6 days of date of PHQ-9 completion.
  3. 3All patients in the ACUDep trial with response data.