Appendix Table 2. List of Variables Included in the Propensity Score.

Characteristics	Variables in the propensity score
Sociodemographic	Age, sex, race, education, and geographical region (state)
Clinical	Psychiatric morbidity, cardiovascular morbidity, cerebrovascular disease, other comorbidities (e.g. Parkinson’s disease, epilepsy, diabetes, obesity, functional impairment), the Charlson index, and use of healthcare services potentially predictive of adverse health outcomes in the short term (e.g. number of days in hospital, number of distinct prescriptions for drugs excluding antipsychotics)
Nursing home facility	Facility size, occupancy rate, availability of special care units, staffing levels, ownership, resident characteristics (e.g. proportion with dementia, depression) and quality indicators (e.g. proportion bedbound)