Table 2. HRV RNA positivity in sera by age group.

		Total	HRVA					HRVC
		nasopharyngeal swabs	serum+	serum−	%	OR (95%CI)	P value	serum+	serum−	%	OR (95%CI)	P value
Age	<6	288	0	47	0.0	-	0.30	0	24	0.0	-	<0.01
(months)	6–11	177	1	26	3.7	1.07 (0.60–1.90)	1.00	3	9	25.0	0.95 (0.80–1.14)	0.75
	12–23	170	2	29	6.5	1.56 (0.58–4.17)	0.23	11	11	50.0	1.40 (0.98–1.99)	0.03
	24–35	79	0	11	0.0	-	1.00	8	8	50.0	1.24 (0.94–1.64)	0.07
	36–	101	1	16	5.9	1.17 (0.66–2.07)	0.42	4	5	44.4	1.08 (0.90–1.30)	0.45
Total		816	4	131	3.0			26	57	31.3

OR is odds ratio calculated with each age groups and the rest of the groups within specie as the point of reference.