Pilot study finds three-month GDS difference in dementia caregivers

A controlled longitudinal pilot study in Poland found a modest difference over time in depressive symptoms among informal caregivers of people with dementia who received an 11-session psychoeducational and supportive program. The group-by-time difference was detected only with the Geriatric Depression Scale-15 (GDS-15): at three months, the estimated difference was β = −1.06 (95% CI −2.11 to −0.01; p = 0.048). The same difference was not reproduced with the Patient Health Questionnaire-9 (PHQ-9), and no significant group-by-time findings were reported for suicidality, caregiving burden or dementia-related knowledge.

The researchers characterized the results as preliminary and hypothesis-generating because the study was small and used non-randomized allocation. The study recruited 103 informal dementia caregivers from five public healthcare institutions in Poland. Forty-four participants entered the intervention group and 59 entered a no-intervention control group.

Caregivers were assessed at baseline, immediately after the intervention and at a three-month follow-up. Depressive symptoms were primary outcomes assessed with both the GDS-15 and PHQ-9. Secondary outcomes included suicidality measured with the Columbia-Suicide Severity Rating Scale, caregiving-burden results measured with the COPE Index, and dementia-related knowledge.

Longitudinal analyses used linear mixed-effects models and generalized estimating equations adjusted for age, sex and education. Retention differed between the groups at the final assessment. At three-month follow-up, 38 of 44 intervention participants remained in the study, compared with 57 of 59 controls, corresponding to reported dropout rates of 13.6% and 3.4%, respectively.

The adjusted group-by-time estimate for GDS-15 scores indicated a slightly greater reduction in scores in the intervention group relative to the control group. Its confidence interval extended close to zero, indicating uncertainty around the magnitude of the estimated difference. After covariate adjustment, the investigators observed no significant intervention effects for PHQ-9 scores, suicidality outcomes, caregiving-burden dimensions or knowledge scores.

Because the GDS-15 finding was not matched by the second depression questionnaire and was not accompanied by significant findings across the secondary outcomes, the available evidence does not establish broad or durable mental-health benefits. Exploratory analyses suggested that improvements were larger among participants who entered the study with more severe depressive symptoms or greater caregiving burden. These analyses were exploratory and do not establish that the program was responsible for the subgroup differences.

The investigators also found that improvements in perceived support quality were associated with reductions in depressive symptoms. That association does not show that improved support caused the reduction in symptoms. Together, the GDS-15 estimate, exploratory patterns and support-quality association identify potential signals for investigation, but they do not provide confirmatory evidence that the intervention changed suicidality, burden, knowledge or depression measured by the PHQ-9.

The study’s quasi-experimental design, modest sample size and non-randomized allocation limit causal interpretation, while unequal attrition further complicates comparisons between the groups. The research was also conducted in Poland among older informal caregivers recruited through public healthcare institutions, so its scope should not be presented as evidence for all dementia caregivers or all caregiver-support programs. The authors state that larger randomized studies with longer follow-up periods are needed to determine whether the program is effective.

Until then, the most specific conclusion supported by the analysis is that participants assigned to the program showed a small, uncertain three-month difference in GDS-15 scores; the study did not demonstrate prevention of suicide, reduced caregiving burden, increased dementia knowledge or a consistent improvement across depression measures.

Subject of Research: Pilot evaluation of an 11-session mental-health support program for informal dementia caregivers in Poland

Article Title: A pilot evaluation of a preventive intervention to support mental health among dementia caregivers: a controlled longitudinal study

Article References: Wieczorek, Ł., Borzym, A., Gawryś, L., Kucharski, M., & Dąbrowska, K. (2026). A pilot evaluation of a preventive intervention to support mental health among dementia caregivers: a controlled longitudinal study. BMC Public Health. https://doi.org/10.1186/s12889-026-29621-1

Image Credits: AI Generated

DOI: 10.1186/s12889-026-29621-1

Keywords: dementia caregivers, depressive symptoms, GDS-15, PHQ-9, psychoeducation, suicidality, caregiving burden, quasi-experimental study, Poland, pilot trial, pilot, evaluation