Table 1. General characteristics and prevalence of SARS-CoV-2 in Lambayeque.

Variable	n (2010)	%*	Prevalence* (IgM/IgG +)	CI 95%*
Province			29.5	[27.6–31.5]
Lambayeque	476	23.6	32.9	[28.7–37.1]
Ferreñafe	163	8.3	22.5	[16.8–29.5]
Chiclayo	1,371	68.1	29.2	[26.9–31.6]
District
<20,000 hab.	538	28.9	23.0%	[19.6–26.7]
20,000–50,000 hab.	469	25.6	32.7%	[28.7–37.0]
>50,000 hab.	1,003	45.6	31.8%	[29.0–34.8]
Age group
9–20 years	220	11.1	26.9%	[21.4–33.2]
21–30 years	329	16.3	31.0%	[26.1–36.1]
31–40 years	394	19.5	34.9%	[30.3–39.8]
41–50 years	353	17.5	31.1%	[26.5–36.2]
51–60 years	315	15.7	29.8%	[25.0–35.1]
61–70 years	215	10.7	24.6%	[19.2–30.8]
71–80 years	129	6.4	20.3%	[14.2–28.2]
>80 years	55	2.7	22.1%	[13.0–35.1]
Sex
Masculine	949	52.7	30.1%	[27.4–33.0]
Femenine	1,061	47.3	28.8%	[26.0–31.8]
Symptomatic
Yes	440	22.8	43.6%	[38.9–48.3]
No	1,570	77.2	25.4%	[23.3–27.5]
Isolation
Yes	810	41.4	25.8%	[22.8–28.9]
No	1,200	58.6	32.2%	[29.6–34.8]
Time of illness
≤14 days	239	55.2	33.3%	[27.5–39.6]
>14 days	201	44.8	56.2%	[49.2–63.0]
A previous visit to healthcare facility
Yes	67	3.4	39.1%	[28.1–51.3]
No	1,943	96.6	29.2%	[27.2–31.2]
Contact with ARI case
Yes	123	5.9	57.2%	[48.2–65.7]
No	1,887	94.1	27.8%	[25.8–29.8]
Contact with a confirmed case
Yes	142	7.2	52.3%	[44.0–60.5]
No	1,868	92.8	27.7%	[25.8–29.8]
Visit a market
Yes	442	21.1	38.0%	[33.6–42.6]
No	1,568	78.9	27.1%	[25.1–29.5]
Co-morbidity
Yes	450	22.3	27.4%	[23.4–31.7]
No	1,560	77.7	30.3%	[27.9–32.4]

Note:

^*Estimates obtained by complex sampling. Strata were district.