Table 3.

Estimated percent change in titers compared with titers found after the first vaccination, adjusted for seasonal influenza virus vaccination by using linear mixed modeling

Time point tested	% change in titer	P value	95 % CI
			Lower	Upper
After second dose at age (yr):
30	−7.0	0.24	−17.7	5.0
40	3.4	0.40	−4.3	11.8
50	15.1	<0.0005	6.4	24.5
60	28.0	<0.0005	13.2	44.8
After 7 mo at age (yr):
30	−22.6	0.11	−43.5	6.1
40	−24.4	0.006	−38.0	−7.7
50	−26.1	0.001	−38.5	−11.3
60	−27.9	0.025	−45.8	−4.0