Deterioration of health-related quality of life: the hidden health burden of informal caregiving.

Informal caregiving is physically and mentally demanding and may lead to poor health and impaired well-being. We aim to check the effects of informal caregiving on health-related quality of life (HRQoL). We utilised longitudinal data from the most recent sixteen waves of the Household, Income and Labour Dynamics in Australia (HILDA) Survey. We measured HRQoL through the physical component summary (PCS), the mental component summary (MCS), the short-form six-dimension (SF-6D) utility index, and the eight dimensions of the SF-36 health survey. The primary exposure variable is informal caregiving. The variable was categorised into not a caregiver, lighter (< 5 hours [h]/week), moderate (5-19 h/week), and intensive (≥ 20 h/week) caregiving based on the hours of providing informal care per week. We have found that informal caregiving negatively affects HRQoL. We found that moderate (β = -0.0035, standard error [SE] = 0.0012) and intensive caregiving (β = -0.0074, SE = 0.0020) reduced SF-6D utility value. We also found that lighter (β = -0.29, SE = 0.07), moderate (β = -0.55, SE = 0.12), and intensive (β = -1.53, SE = 0.19) caregiving lowered MCS scores. Moreover, our results revealed that lighter, moderate and intensive caregiving decreases the scores of mental health-related dimensions (e.g., role emotional, social functioning, and mental health) of the SF-36 health survey. Our study findings have significant policy implications for improving the HRQoL and well-being of caregivers. To effectively support the health and well-being of informal carers, it is crucial to implement strategies that address their diverse needs, including supporting work-life balance, providing financial assistance and social security measures, ensuring access to community-based services, providing access to relevant information and training, and offering respite care options.