Unplanned index hospital admissions among new older high-cost health care users in Ontario: a population-based matched cohort study

Department of Health Research Methods, Evidence, and Impact (Muratov, Lee, Holbrook, Mbuagbaw, Tarride) and Divisions of Geriatric Medicine (Lee) and Clinical Pharmacology and Toxicology (Holbrook), Department of Medicine, McMaster University, Hamilton, Ont.; ICES (Paterson, Gomes, Khuu, Pequeno), Toronto, Ont.; Département de médecine sociale et préventive (Guertin), Faculté de médecine, and Centre de recherche du Centre hospitalier universitaire de Québec (Guertin), Axe Santé des populations et pratiques optimales en santé, Université Laval, Québec, Que.; Li Ka Shing Knowledge Institute (Gomes), St. Michael’s Hospital, Toronto, Ont.; Centre for Health Economics and Policy Analysis (Tarride) and Department of Family Medicine (Paterson), McMaster University, Hamilton, Ont.

Department of Health Research Methods, Evidence, and Impact (Muratov, Lee, Holbrook, Mbuagbaw, Tarride) and Divisions of Geriatric Medicine (Lee) and Clinical Pharmacology and Toxicology (Holbrook), Department of Medicine, McMaster University, Hamilton, Ont.; ICES (Paterson, Gomes, Khuu, Pequeno), Toronto, Ont.; Département de médecine sociale et préventive (Guertin), Faculté de médecine, and Centre de recherche du Centre hospitalier universitaire de Québec (Guertin), Axe Santé des populations et pratiques optimales en santé, Université Laval, Québec, Que.; Li Ka Shing Knowledge Institute (Gomes), St. Michael’s Hospital, Toronto, Ont.; Centre for Health Economics and Policy Analysis (Tarride) and Department of Family Medicine (Paterson), McMaster University, Hamilton, Ont.

Department of Health Research Methods, Evidence, and Impact (Muratov, Lee, Holbrook, Mbuagbaw, Tarride) and Divisions of Geriatric Medicine (Lee) and Clinical Pharmacology and Toxicology (Holbrook), Department of Medicine, McMaster University, Hamilton, Ont.; ICES (Paterson, Gomes, Khuu, Pequeno), Toronto, Ont.; Département de médecine sociale et préventive (Guertin), Faculté de médecine, and Centre de recherche du Centre hospitalier universitaire de Québec (Guertin), Axe Santé des populations et pratiques optimales en santé, Université Laval, Québec, Que.; Li Ka Shing Knowledge Institute (Gomes), St. Michael’s Hospital, Toronto, Ont.; Centre for Health Economics and Policy Analysis (Tarride) and Department of Family Medicine (Paterson), McMaster University, Hamilton, Ont.

Department of Health Research Methods, Evidence, and Impact (Muratov, Lee, Holbrook, Mbuagbaw, Tarride) and Divisions of Geriatric Medicine (Lee) and Clinical Pharmacology and Toxicology (Holbrook), Department of Medicine, McMaster University, Hamilton, Ont.; ICES (Paterson, Gomes, Khuu, Pequeno), Toronto, Ont.; Département de médecine sociale et préventive (Guertin), Faculté de médecine, and Centre de recherche du Centre hospitalier universitaire de Québec (Guertin), Axe Santé des populations et pratiques optimales en santé, Université Laval, Québec, Que.; Li Ka Shing Knowledge Institute (Gomes), St. Michael’s Hospital, Toronto, Ont.; Centre for Health Economics and Policy Analysis (Tarride) and Department of Family Medicine (Paterson), McMaster University, Hamilton, Ont.

Department of Health Research Methods, Evidence, and Impact (Muratov, Lee, Holbrook, Mbuagbaw, Tarride) and Divisions of Geriatric Medicine (Lee) and Clinical Pharmacology and Toxicology (Holbrook), Department of Medicine, McMaster University, Hamilton, Ont.; ICES (Paterson, Gomes, Khuu, Pequeno), Toronto, Ont.; Département de médecine sociale et préventive (Guertin), Faculté de médecine, and Centre de recherche du Centre hospitalier universitaire de Québec (Guertin), Axe Santé des populations et pratiques optimales en santé, Université Laval, Québec, Que.; Li Ka Shing Knowledge Institute (Gomes), St. Michael’s Hospital, Toronto, Ont.; Centre for Health Economics and Policy Analysis (Tarride) and Department of Family Medicine (Paterson), McMaster University, Hamilton, Ont.

Department of Health Research Methods, Evidence, and Impact (Muratov, Lee, Holbrook, Mbuagbaw, Tarride) and Divisions of Geriatric Medicine (Lee) and Clinical Pharmacology and Toxicology (Holbrook), Department of Medicine, McMaster University, Hamilton, Ont.; ICES (Paterson, Gomes, Khuu, Pequeno), Toronto, Ont.; Département de médecine sociale et préventive (Guertin), Faculté de médecine, and Centre de recherche du Centre hospitalier universitaire de Québec (Guertin), Axe Santé des populations et pratiques optimales en santé, Université Laval, Québec, Que.; Li Ka Shing Knowledge Institute (Gomes), St. Michael’s Hospital, Toronto, Ont.; Centre for Health Economics and Policy Analysis (Tarride) and Department of Family Medicine (Paterson), McMaster University, Hamilton, Ont.

Department of Health Research Methods, Evidence, and Impact (Muratov, Lee, Holbrook, Mbuagbaw, Tarride) and Divisions of Geriatric Medicine (Lee) and Clinical Pharmacology and Toxicology (Holbrook), Department of Medicine, McMaster University, Hamilton, Ont.; ICES (Paterson, Gomes, Khuu, Pequeno), Toronto, Ont.; Département de médecine sociale et préventive (Guertin), Faculté de médecine, and Centre de recherche du Centre hospitalier universitaire de Québec (Guertin), Axe Santé des populations et pratiques optimales en santé, Université Laval, Québec, Que.; Li Ka Shing Knowledge Institute (Gomes), St. Michael’s Hospital, Toronto, Ont.; Centre for Health Economics and Policy Analysis (Tarride) and Department of Family Medicine (Paterson), McMaster University, Hamilton, Ont.

Department of Health Research Methods, Evidence, and Impact (Muratov, Lee, Holbrook, Mbuagbaw, Tarride) and Divisions of Geriatric Medicine (Lee) and Clinical Pharmacology and Toxicology (Holbrook), Department of Medicine, McMaster University, Hamilton, Ont.; ICES (Paterson, Gomes, Khuu, Pequeno), Toronto, Ont.; Département de médecine sociale et préventive (Guertin), Faculté de médecine, and Centre de recherche du Centre hospitalier universitaire de Québec (Guertin), Axe Santé des populations et pratiques optimales en santé, Université Laval, Québec, Que.; Li Ka Shing Knowledge Institute (Gomes), St. Michael’s Hospital, Toronto, Ont.; Centre for Health Economics and Policy Analysis (Tarride) and Department of Family Medicine (Paterson), McMaster University, Hamilton, Ont.

Department of Health Research Methods, Evidence, and Impact (Muratov, Lee, Holbrook, Mbuagbaw, Tarride) and Divisions of Geriatric Medicine (Lee) and Clinical Pharmacology and Toxicology (Holbrook), Department of Medicine, McMaster University, Hamilton, Ont.; ICES (Paterson, Gomes, Khuu, Pequeno), Toronto, Ont.; Département de médecine sociale et préventive (Guertin), Faculté de médecine, and Centre de recherche du Centre hospitalier universitaire de Québec (Guertin), Axe Santé des populations et pratiques optimales en santé, Université Laval, Québec, Que.; Li Ka Shing Knowledge Institute (Gomes), St. Michael’s Hospital, Toronto, Ont.; Centre for Health Economics and Policy Analysis (Tarride) and Department of Family Medicine (Paterson), McMaster University, Hamilton, Ont.

Department of Health Research Methods, Evidence, and Impact (Muratov, Lee, Holbrook, Mbuagbaw, Tarride) and Divisions of Geriatric Medicine (Lee) and Clinical Pharmacology and Toxicology (Holbrook), Department of Medicine, McMaster University, Hamilton, Ont.; ICES (Paterson, Gomes, Khuu, Pequeno), Toronto, Ont.; Département de médecine sociale et préventive (Guertin), Faculté de médecine, and Centre de recherche du Centre hospitalier universitaire de Québec (Guertin), Axe Santé des populations et pratiques optimales en santé, Université Laval, Québec, Que.; Li Ka Shing Knowledge Institute (Gomes), St. Michael’s Hospital, Toronto, Ont.; Centre for Health Economics and Policy Analysis (Tarride) and Department of Family Medicine (Paterson), McMaster University, Hamilton, Ont.