Table 1 -. Baseline characteristics of the study population according to occupation and data collection period. Mexico City, Mexico, 2020-2021 .

	Occupation
Variables	Physicians (n = 76)				Nurses (n = 96)
	PRE *	PEAK †	POST ‡	p-value	PRE *	PEAK †	POST ‡	p-value
	(n = 27)	(n = 24)	(n = 25)		(n = 19)	(n = 44)	(n = 33)
Gender, n (%)
Female	9 (33.3)	7 (29.2)	10 (40.0)		19 (100.0)	32 (72.7)	30 (90.9)
Male	18 (66.7)	17 (70.8)	15 (60.0)	0.722 §	0 (0.0)	12 (27.3)	3 (9.1)	0.008 ǁ
Work schedule, n (%)
Day	17 (63.0)	16 (66.7)	14 (56.0)		12 (63.2)	40 (90.9)	24 (72.7)
Night	10 (37.0)	8 (33.3)	11 (44.0)	0.736 §	7 (36.8)	4 (9.1)	9 (27.3)	0.020 ǁ

^* PRE = It denotes the pre-pandemic period;

^† PEAK = It denotes the first peak of COVID-19 hospital admissions in Mexico;

^‡ POST = It denotes the period after COVID-19 care ended;

^§ Frequency differences were compared with the chi-square test;

^ǁǁ Frequency differences were compared with Fisher’s exact test