Table 2.

Seroprevalence (95% confidence intervals) of SARS-CoV-2 IgG among 940 coffee manufacturing workers by demographic, clinical, and occupational characteristics.

Variable	Number of participants (N = 940)	Positive (N = 49)	Seroprevalence [95% CI]
Gender
Female	410 (43.6)	19	4.63 [2.60–6.67]
Male	530 (56.4)	30	5.66 [3.69–7.63]
Age (years)
20–29	133 (14.2)	10	7.52 [3.04–12.00]
30–39	281 (29.9)	13	4.63 [2.49–7.78]
40–49	290 (30.9)	14	4.83 [2.36–7.29]
50–59	214 (22.8)	9	4.21 [1.52–6.89]
60–69	22 (2.3)	3	13.64 [0–27.98]
COVID-19 symptoms
No	671 (71.4)	19	2.83 [1.58–4.09]
Yes	269 (28.6)	30	11.15 [7.39–14.91]
COVID-19 diagnosis (N = 939)
No	937 (99.8)	47	5.02 [3.62–6.41]
Yes	2 (0.2)	1	-
Familiar COVID-19 diagnosis
No	920 (97.9)	47	5.11 [3.69–6.53]
Yes	20 (2.1)	2	10.00 [0.00–23.15]
Children cohabitation
No	511 (54.5)	26	5.09 [3.18–6.99]
Yes	426 (45.5)	22	5.16 [3.06–7.27]
Working during lockdown
No	666 (70.9)	26	3.90 [2.43–5.37]
Yes	274 (29.2)	23	8.39 [5.11–11.68]
Public contact
No	925 (98.4)	47	5.08 [3.67–6.50]
Yes	15 (1.6)	2	13.33 [0.00–30.54]