Table 4.

Stratified population-based age distribution between 2020 (n = 475) and 2021 (232), considering SARS-CoV-2 positive rate.

Age Range	Positive SARS-CoV-2 Detection Until December 2020	Positive SARS-CoV-2 Detection Until November 2021
	% (n. pos/n. tot)	% (n. pos/n. tot)	p < Value (Chi2 Test)
18–20	25 (1/4)	5.5 (1/18)	0.85
21–30	18.76 (6/32)	3.9 (2/52)	0.02
31–40	36.84 (21/57)	15.6 (10/64)	0.001
41–50	46.93 (46/98)	27.17 (25/92)	0.004
51–60	54–6 (95/174)	29–93 (44/147)	0.00007
61–70	50.76 (100/197)	27.9 (60/215)	0.00001
71–80	40 (100/240)	25.79 (57/221)	0.0003
81–90	44.84 (94/194)	19.01 (31/163)	0.00001
91–98	31.03 (12/29)	11.07 (2/17)	0.03

Bold for significative difference; percentage of the number of positive on total number of samples analised (% n. pos/n. tot).