Table 1.

Description of newly admitted long-term care home residents meeting study inclusion and exclusion criteria by admission period.

Cohort selection step	2018/2019	2019/2020	Pandemic 2020/2021
Total long-term care residents admitted within period and assessed with MDS 2.0 assessment	39 854	39 997	26 228
Exclusions
Age < 18	31	21	8
Comatose	5	13	19
Expected short (<90 d) length of stay	4136	3852	323
Met CIHI DRG01 quality indicator exclusion criteria (not mutually exclusive)	4683	5094	4266
Schizophrenia	15.9%	14.1%	12.4%
Huntington’s disease	1.8%	1.1%	1.2%
End-stage disease	25.5%	26.4%	28.6%
Hospice care	3.7%	4.4%	3.4%
Hallucinations	25.8%	25.8%	27.7%
Delusions	48.4%	50.7%	50.1%
Total long-term care residents meeting primary study cohort inclusion criteria	30 999	31 017	21 612
Total long-term care residents assessed with follow-up MDS 2.0 assessment 70-110 d later	24 919	24 999	17 057
Exclusions
Follow-up MDS 2.0 assessment occurred during subsequent period	6269	5839	4375
Met CIHI DRG01 quality indicator exclusion criteria at follow-up (not mutually exclusive)	1667	1800	1327
Schizophrenia	2.0%	2.1%	1.7%
Huntington’s disease	0.2%	0.2%	0.2%
End-stage disease	30.8%	31.2%	34.1%
Hospice care	4.3%	5.6%	4.5%
Hallucinations	25.0%	27.4%	24.3%
Delusions	54.7%	53.8%	52.7%
Total long-term care residents meeting secondary study cohort inclusion criteria	16 983	16 860	11 355

DRG01 = Percentage of residents on antipsychotics without a diagnosis of psychosis.