Table 6

Correlation of change in PHQ-9, PSWQ-PW scores and change in speed, accuracy

OutcomeTimePHQ-9PSWQ
Week 6–BLWeek 6–BL
r* (95% CI)P valuer* (95% CI)P value
SRT speed
Week 6–BL0.21 (−0.06 to 0.46)0.1210.08 (−0.20 to 0.34)0.583
WM speed
Week 6–BL0.22 (−0.05 to 0.47)0.1020.08 (−0.19 to 0.34)0.552
WM accuracy
Wk 6–BL−0.02 (−0.28 to 0.25)0.902−0.27 (−0.50 to 0.00)0.047*

  • There is an association suggested with change in PSWQ score and WM accuracy score (*p=0.047). With an improvement in WM accuracy, there is a greater reduction in PSWQ-PW (improved accuracy and lower anxiety level).

  • With PSWQ-PW change where subjects scores indicate greater anxiety level from BL to 6 weeks, there is reduction in accuracy (see figure 1 below).

  • *r = Pearson’s correlation coefficient.

  • BL, baseline; PHQ-9, Patient Health Questionnaire; PSWQ-PW, Penn State Worry Questionnaire-Past Week; SRT, Simple Reaction Test; WM, working memory.