Table 1.

Percentages of children with rSBA titers of >1:8 and rSBA GMTs for each time point

Yr	Age (range) (yr)	No.	No. [% (95% CI)] with rSBA titer of >1:8	rSBA GMT (95% CI)
2001-2002	3.9 (3.5-5)	287	109 [38.0 (35.1-40.8)]	8.0 (6.5-9.9)
2003	5.0 (4.5-6.1)	194	56 [28.9 (25.6-32.1)]	5.4 (4.2-6.8)
2004-2005	7.1 (6.0-8.3)	151	46 [30.5 (26.7-34.2)]	5.8 (4.4-7.7)
2007	9.0 (8.6-10.1)	138	31 [22.5 (18.9-26.0)]	4.3 (3.4-5.5)
2010	12.2 (11.5-13.5)	98	15 [15.3 (11.7-18.9)]	3.3 (2.5-4.3)