Table 2.

Prevalence of SARS-CoV-2 antibodies in Mongolia by region, sex and age in late 2020.

	N, total	n, seropositive	Crude prevalence rate	Weighted prevalence rate*	Test adjusted prevalence rate **
Total	5000	72	1·44 (1·21-1·67)	1·36 (1·11-1·63)	1·45 (1·11-1·63)
Residential location
Urban	2300	30	1·3 (0·99-1·64)	1·31 (0·98-1·67)	1·39 (0·98-1·67)
Rural	2700	42	1·55 (1·24-1·89)	1·44 (1·13-1·76)	1·53 (1·13-1·76)
Sex
Female	3242	51	1·57 (1·27-1·88)	1·45 (1·15-1·77)	1·54 (1·15-1·77)
Male	1758	21	1·19 (0·85-1·56)	1·28 (0·89-1·7)	1·35 (0·89-1·7)
Age in years
0 to 4	579	8	1·38 (0·76-2·08)	1·85 (1·0-2·88)	1·97 (1·0-2·88)
5 to 9	559	1	0·18 (0·0-0·45)	0·1 (0·0-0·26)	0·1 (0·0-0·26)
10 to 14	430	6	1·4 (0·69-2·2)	1·96 (0·87-3·28)	2·09 (0·87-3·28)
15 to 19	330	5	1·52 (0·63-2·52)	1·24 (0·52-2·1)	1·32 (0·52-2·1)
20 to 29	816	15	1·83 (1·21-2·53)	1·51 (0·94-2·16)	1·6 (0·94-2·16)
30 to 39	823	19	2·31 (1·6-3·07)	1·98 (1·29-2·74)	2·11 (1·29-2·74)
40 to 49	677	11	1·63 (1·0-2·33)	1·45 (0·79-2·25)	1·54 (0·79-2·25)
50 to 59	468	3	0·63 (0·21-1·19)	0·38 (0·11-0·72)	0·4 (0·11-0·72)
60 to 69	218	3	1·37 (0·43-2·58)	1·81 (0·43-3·57)	1·92 (0·43-3·57)
70 and above	99	1	1·0 (0·0-2·63)	0·62 (0·0-1·6)	0·65 (0·0-1·6)
Occupational type
Non-health sector	3456	46	1·33 (1·07-1·6)	1·19 (0·92-1·48)	1·26 (0·92-1·48)
Healthcare worker	588	10	1·7 (1·01-2·49)	1·58 (0·89-2·35)	1·68 (0·89-2·35)
Comorbidity (1 or more)
Yes	216	3	1·39 (0·45-2·59)	1·09 (0·28-2·15)	1·15 (0·28-2·15)
No	4784	69	1·44 (1·2-1·68)	1·37 (1·11-1·65)	1·46 (1·11-1·65)

Rate% (95%CI, Lower and Upper Bound), *- Stratification factor not included for weighted estimation, **-Adjusted rate for Wantai, total antibodies test sensitivity