Table 5 Internal consistency, predictive validity, normality, and criterion validity of the Depression Anxiety Stress Scale (DASS) 21, DASS-12, DASS-8, and their subscales among women with chronic pelvic pain.

Coefficient alpha

0.945

0.931

0.837

0.878

0.898

0.845

0.693

0.827

0.901

0.892

0.794

0.705

Range of corrected item-total correlations

0.401–0.776

0.598–0.847

0.370–0.713

0.593–0.735

0.401–0.785

0.607–0.719

0.371–0.550

0.607–0.746

0.629–0.744

0.882–0.944

0.634–0.662

0.545

Range of alpha if-item-deleted

0.940–0.946

0.914–0.939

0.795–0.853

0.851–0.869

0.881–0.902

0.787–0.833

0.585–0.708

0.742–0.809

0.884–0.893

0.831–0.870

0.702–0.733

–

Correlation with subscale of the DASS-21

–

–

–

–

–

0.930***

0.919***

0.948***

–

0.934***

0.871***

0.871***

Correlation with the DASS-21

–

0.856***

0.823***

0.929***

0.966***

0.838***

0.718***

0.863***

0.943***

0.811***

0.789***

0.818***

Shapiro Wilk test

0.892***

0.812***

0.848***

0.936***

0.906***

0.787***

0.843***

0.933***

0.864***

0.788***

0.790***

0.891***

Correlation with sexual assault experience

0.203**

0.264***

0.196**

0.134

0.192*

0.278***

0.095

0.106

0.259**

0.245**

0.261***

0.188*

Correlation with pain days/month

0.183**

0.137

0.221**

0.183**

0.193**

0.190**

0.204**

0.136

0.180*

0.177*

0.172*

0.163*

Correlation with pain-free days/month

− 0.182**

− 0.132

− 0.217**

− 0.174*

− 0.193**

− 0.188**

− 0.201**

− 0.139*

− 0.179*

− 0.173*

− 0.168*

− 0.168*

Correlation with severity of pain today

0.265***

0.217**

0.331***

0.238**

0.290***

0.255***

0.291***

0.239**

0.265***

0.225**

0.274***

0.234**

Correlation with severity of stabbing pelvic pain

0.200**

0.167*

0.287**

0.138

0.209**

0.174*

0.246**

0.143

0.205**

0.149*

0.246**

0.153*

Correlation with severity of pain during sexual activity

0.262**

0.308***

0.210*

0.222**

0.280**

0.326***

0.187*

0.229**

0.257**

0.285**

0.218**

0.227**

Correlation with severity of bad headache

0.387***

0.300**

0.253**

0.378***

0.395***

0.324***

0.221*

0.363***

0.299**

0.303**

0.225*

0.234**

Correlation with experienced anxiety

0.517**

0.430**

0.412**

0.491**

0.498**

0.427**

0.323**

0.478**

0.531**

0.425**

0.473**

0.467**

Correlation with experienced low mood

0.487**

0.482**

0.323**

0.446**

0.478**

0.512**

0.227**

0.447**

0.514**

0.492**

0.400**

0.412**

Correlation with experienced fatigue

0.345**

0.296**

0.333**

0.305**

0.348**

0.300**

0.346**

0.288**

0.322**

0.283**

0.231**

0.298**

Correlation with poor sleep

0.303**

0.250**

0.337**

0.248**

0.305**

0.227**

0.329**

0.238**

0.283**

0.246**

0.240**

0.257**

Correlation with dizziness

0.251**

0.174**

0.333**

0.191**

0.243**

0.192**

0.335**

0.150*

0.244**

0.181**

0.262**

0.211**

Correlation with unusual sweating

0.238**

0.182**

0.280**

0.215**

0.239**

0.174*

0.306**

0.197**

0.222**

0.179**

0.189**

0.257**

Correlation with nausea

0.256**

0.240**

0.339**

0.180*

0.259**

0.221**

0.349**

0.145*

0.236**

0.219**

0.260**

0.154*

Correlation with bloating

0.259**

0.216**

0.255**

0.206**

0.247**

0.213**

0.234**

0.193**

0.279**

0.245**

0.234**

0.246**