Table 1.

Information of antibodies positive populations

			IgM+			IgG+			IgM+ and/or IgG+
variables	subgroups	tested No.	No.	% (95% CI)	MFR	No.	% (95% CI)	MFR	No.	% (95% CI)	MFR
Age	≤9	1601	3	0.19% (0.05–0.60)	—	21	1.31% (0.83–2.03)	1.41	24	1.50% (0.98–2.26)	1.74
	10–19	3593	6	0.17% (0.07–0.38)	—	40	1.11% (0.81–1.53)	1.42	44	1.22% (0.90–1.66)	1.65
	20–29	7566	9	0.12% (0.06–0.23)	0.27	57	0.75% (0.58–0.98)	0.98	65	0.86% (0.67–1.10)	0.81
	30–39	10237	25	0.24% (0.16–0.37)	0.45	132	1.29% (1.08–1.53)	0.73	156	1.52% (1.30–1.79)	0.69
	40–49	8951	32	0.36% (0.25–0.51)	1.35	169	1.89% (1.62–2.20)	0.88	196	2.19% (1.90–2.52)	0.95
	50–59	10230	69	0.67% (0.53–0.86)	0.63	238	2.33% (2.05–2.64)	0.85	298	2.91% (2.60–3.26)	0.77
	60–69	10089	89	0.88% (0.71–1.09)	0.50	296	2.93% (2.62–3.29)	0.77	371	3.68% (3.32–4.07)	0.68
	70–79	5672	65	1.15% (0.89–1.47)	0.56	173	3.05% (2.63–3.54)	0.91	221	3.90% (3.41–4.44)	0.79
	80–89	3117	24	0.77% (0.51–1.16)	0.71	68	2.18% (1.71–2.77)	0.69	88	2.82% (2.28–3.48)	0.68
	90+	381	2	0.52% (0.09–2.09)	0.00	6	1.57% (0.64–3.57)	0.21	7	1.84% (0.81–3.92)	0.18
Sex	Male	30032	119	0.4% (0.33–0.48)		525	1.75% (1.60–1.90)		615	2.05% (1.89–2.22)
	Female	31405	205	0.65% (0.57–0.75)		675	2.15% (1.99–2.32)		855	2.72% (2.55–2.91)
Total		61437	324	0.53% (0.47–0.59)	0.61	1200	1.95% (1.85–2.07)	0.81	1470	2.39% (2.27–2.52)	0.75

Dash symbols in MFR column represent zero positive cases in the corresponding female groups. CI, confidence interval; MFR, male-to-female ratio.