Can brief telephone interventions reduce caregiver burden and depression in caregivers of people with cognitive impairment? - long-term results of the German day-care study (RCT).

BACKGROUND

Day-care and telephone counseling have been discussed as effective support measures for caregivers of people with cognitive impairment.

METHODS

In a two-arm cluster-randomized trial involving multicomponent therapy for cognitively impaired persons in day-care centers and telephone counseling for their caregivers versus treatment as usual (TAU), we investigated long-term effects on caregivers' burden and depressiveness. Person-caregiver dyads involving home-dwelling persons with MCI, mild dementia, or moderate dementia were eligible. Day-care centers were randomized into an intervention group (IG) or a control group (CG). Outcome assessors were blinded. Out of 359 caregivers who had completed a 6-month intervention phase (n = 205, n = 154), a total of 304 of them were available at the 12-month follow-up (n = 173, n = 131). Instruments for assessing were the Burden Scale for Family Caregivers - short version (BSFC-s) (caregiver burden) and the Well-Being Index Score (WHO-5) (depressiveness). Mixed ANOVAs were used for the main analyses; descriptive statistics and subgroup analyses were additionally performed; secondary analyses involved multiple linear regressions for the main outcomes that were significant in the unadjusted main analysis.

RESULTS

At follow-up, crude mean differences showed a nonsignificant advantage for the IG in caregiver burden [IG: -.20 (SD = 5.39) vs. CG: .76 (SD = 5.49), p = .126, d = .177] and depressiveness (reverse scored) [IG: -.05 (SD = 5.17) vs. CG: -.98 (SD = 5.65), p = .136, d = .173]. For caregiver burden, a mixed ANOVA resulted in significant main effects of group (F (1, 302) = 4.40; p = .037) and time (F (1.88, 568.96) = 3.56; p = .032) but not a significant interaction. The largest effects were found for the "mild dementia" subgroup (d = .443 for caregiver burden and d = .520 for depressiveness).

DISCUSSION

Positive long-term effects of a combined intervention involving telephone counseling for caregivers and multicomponent activation for patients were observed especially for mild dementia. However, the treatment effects washed out after the intervention ended.

TRIAL REGISTRATION

ISRCTN16412551 (date: 30 July 2014, retrospectively).