Determinants of primary and non-primary informal care-giving to home-based palliative care cancer care-recipients in Ontario, Canada.

Informal care plays an important role in the care of care-recipients. Most of the previous studies focused on the primary caregivers and ignored the importance of non-primary caregivers. Moreover, little is known about the provision of informal care in the context of home-based palliative care. The purpose of this study was to examine the provision of primary and non-primary informal care-giving and their respective determinants. Primary caregivers assume the main responsibility for care, while non-primary caregivers are those other than the primary caregiver who provide care-giving. A longitudinal, prospective cohort design was conducted and data were drawn from two palliative care programs in Canada between November 2013 and August 2017. A total of 273 caregivers of home-based palliative care cancer care-recipients were interviewed biweekly until the care recipient died. The outcomes were the propensity and intensity of informal care-giving. Regression analysis with instrumental variables was used. About 90% of primary caregivers were spouses and children, while 53% of non-primary caregivers were others rather than spouses and children. The average number of hours of primary and non-primary informal care-giving reported for each 2-week interview period was 83 hr and 23 hr, respectively. Hours of home-based personal support workers decreased the intensity of primary care-giving and the likelihood of non-primary care-giving. Home-based nursing visits increased the propensity of non-primary care-giving. The primary care-giving and non-primary care-giving complement each other. Care recipients living alone received less primary informal care-giving. Employed primary caregivers decreased their provision of primary care-giving, but promoted the involvement of non-primary care-giving. Our study has clinical practices and policy implications. Suitable and targeted interventions are encouraged to make sure the provision of primary and non-primary care-giving, to balance the work of the primary caregivers and their care-giving responsibility, and to effectively arrange the formal home-based palliative care services.