Table 1 Exploratory factor analysis (varimax rotation) of the self-reported questionnaire (SRQ-20) items

Poor appetite (SRQ2)

0.833

-

-

Poor digestion (SRQ7)

0.735

-

-

Headaches (SRQ1)

0.617

-

-

Uncomfortable feelings in your stomach (SRQ19)

0.606

-

-

Feel tried all the time (SRQ18)

0.537

0.511

-

Bad sleep (SRQ3)

0.501

0.431

-

Easily tired (SRQ20)

0.449

0.631

Hands shake (SRQ5)

0.404

0.598

-

Cry more than usual (SRQ10)

-

0.802

-

Thoughts of ending your life (SRQ17)

-

0.633

-

Feel worthlessness (SRQ16)

-

0.604

0.480

Nervous, tense, worried (SRQ6)

-

0.586

-

Frightened easily (SRQ4)

-

0.552

-

Unhappy (SRQ9)

-

0.473

0.612

Trouble thinking clearly (SRQ8)

-

0.319

-

Difficulty making decisions (SRQ12)

-

-

0.825

Difficulty enjoying activities (SRQ11)

-

-

0.774

Unable to play a useful part in life (SRQ14)

-

-

0.665

Lost interest in things (SRQ15)

-

-

0.572

Daily work suffering (SRQ13)

-

-

0.561