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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.
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