Adaptation and psychometric validation of the Prolonged Grief Disorder scale among widows in central Nepal

Symptoms of grief vary by culture and societal reactions to death may be gender specific. We aimed to validate a Nepali language version of the Prolonged Grief-13 item scale (PG-13) among widows.

We tested two adapted versions of a Prolonged Grief Disorder (PGD) instrument with 204 Nepali-speaking widows: one was a Nepali translation of the original PG-13 items, while the other contained five additional items derived from qualitative research. We evaluated internal consistency, factor structure, and construct and criterion validity.

Participants were on average 44 years old (SD=9.3), completed 6.7 years of school (SD=3.3) and had survived their husbands by 10 years (SD=8.1). Thirteen percent met global criteria for PGD. The removal of one original PG-13 item (felt emotionally numb) from both versions due to poor discriminant validity resulted in 12- and 17-item versions. Exploratory factor analysis supported a one-factor structure for the PG-12 and PG-17. Both versions of the scale exhibited high internal consistency (0.89 and 0.93 respectively). Confirmatory factor analysis suggested that symptoms of PGD were distinct from post-traumatic stress disorder (PTSD), anxiety and depressive symptoms. The PG-12 had lower sensitivity (74.1%) but higher specificity (83.6%) compared to the PG-17 (81.5% and 73.5% respectively).

Psychosocial counselors' clinical interview global ratings were used as the standard for comparison in criterion validity analyses. Generalizability to other socio-cultural (e.g. non-widowed, low-caste) populations and men in Nepal cannot be assumed.

Results indicate satisfactory psychometric properties and validity of both versions of the PG instruments, supporting their use with Nepali speaking widows.