Table 3.

Correspondence between lockdown and control periods and estimated occupancy.

Period	Lockdown period			Control period
	Dates	Description	Estimated occupancy	Dates
P0	10/02/20–15/03/20	Beginning of the second semester 19/20 with normal operating conditions.	100%	11/02/19–17/03/19
P1	16/03/20–17/05/20	Total lockdown, access to buildings is prohibited.	0%	18/03/19–19/05/19
P2	18/05/20–21/06/20	Lockdown easing, access to buildings is allowed although occupancy is minimised and teleworking is maintained.	5%	20/05/19–23/06/19
P3	22/06/20–31/07/20	Resumption plan, buildings’ occupation is allowed at 50%.	30%	24/06/19–31/07/19
P4	01/08/20–31/08/20	Summer holidays.	0%	01/08/19–31/08/19
P5	01/09/20–13/09/20	Preparation of the first semester 20/21.	10%	01/09/19–15/09/19
P6	14/09/20–18/10/20	Beginning of the first semester 20/21. Face-to-face classes restricted to first year students and lab sessions.	33%	16/09/19–20/10/19
P7	19/10/20–22/12/20	Face-to-face classes are suspended, except lab sessions and exams.	5%	21/10/19–20/12/19
P8	23/12/20–06/01/21	Winter holidays.	0%	21/12/19–06/01/20
P9	07/01/21–14/02/21	Exam period (only a few of them are face-to-face) and preparation of the second semester 20/21.	10%	07/01/20–16/02/20
P10	15/02/21–14/03/21	Beginning of the second semester 20/21. Face-to-face classes restricted to first year students and lab sessions.	33%	17/02/20–15/03/20