Outcome | Age–sex adj. s/HR | Age–sex adj. s/HR | Fully adj. s/HR‡ Model 1 | Fully adj. s/HR‡ Model 2 |
Urgent hospitalisation | ||||
Dementia | 0.815* (0.800, 0.832) | – | 0.843* (0.827, 0.860) | 0.891* (0.844, 0.941) |
Frailty (FI continuous) | – | 1.209* (1.199, 1.220) | 1.159* (1.149, 1.169) | 1.165* (1.153, 1.177) |
Dementia–frailty term | – | – | – | 0.979* (0.960, 0.999) |
P for interaction | – | – | – | 0.036 |
LTC admission | ||||
Dementia | 2.749* (2.679, 2.821) | – | 2.598* (2.530, 2.668) | 5.814* (5.413, 6.245) |
Frailty (FI continuous) | – | 1.472* (1.454, 1.490) | 1.490* (1.471, 1.509) | 1.727* (1.697, 1.757) |
Dementia–frailty term | – | – | – | 0.748* (0.730, 0.767) |
P for interaction | – | – | – | <0.001 |
Mortality | ||||
Dementia | 0.901* (0.874, 0.928) | – | 0.869* (0.843, 0.895) | 0.677* (0.619, 0.740) |
Frailty (FI continuous) | 1.507* (1.488, 1.527) | 1.478* (1.459, 1.498) | 1.442* (1.419, 1.465) | |
Dementia–frailty term | – | – | – | 1.090* (1.059, 1.122) |
P for interaction | – | – | – | <0.001 |
*P<0.05.
†For urgent hospitalisation and LTC admission, estimates are subdistribution HRs and corresponding 95% CIs from Fine-Gray model; for mortality, estimates are HRs and corresponding 95% CIs from Cox proportional hazards regression model.
‡Models adjusted for age, sex, marital status, rurality, income quintile and multimorbidity count; Model 2 additionally includes dementia–frailty interaction term.
FI, frailty index; LTC, long-term care.