Table. Potential number of coronavirus disease (of COVID-19) deaths in institutions for dependent elderly people, by proportion of infected institutions and final attack rate among residents, France, March 2020 (n = 766,400 residents).

Attack rate among residents	Percentage of infected institutions
	30%		40%		50%
	n	95% CI	n	95% CI	n	95% CI
30%	8,682	7,283–10,283	11,576	9,710–13,711	14,470	12,138–17,138
40%	11,576	9,710–13,711	15,435	12,947–18,281	19,294	16,184–22,851
50%	14,470	12,138–17,138	19,294	16,184–22,851	24,117	20,230–28,564

CI: confidence interval.

Age distribution of residents, based on 40 “Habitat et Humanisme” institutions: 60–69 years: 2.85%; 70–79 years: 11.5%; ≥ 80 years: 85.7% (personal communication: Emile Hobeika, March 2020).

We used the age-stratified case fatality ratios and their 95% CI from [2].