Table 3 SARS CoV-2 antibody prevalence, June–October 2020, with 95% confidence intervals (CI)

From: Health literacy and changes in pattern of drug use among participants at the Stockholm Needle Exchange Program during the COVID-19 pandemic

Month	n	Positive (n)	Negative (n)	N/A (n)	Positive (%)	CI 95%
June	120	5	114	1	4.2	1.8–9.4
July	176	12	162	2	6.8	3.9–11.5
August	187	8	177	2	4.3	2.2–8.2
September	218	10	205	3	4.6	2.5–8.2
October	78	7	69	2	9.0	4.4–17.4
Accumulated	779	42	727	10	5.4	4.0–7.2

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