Table 1. Correlation between baseline HAI titer and B-cell immune responses.

Group	Immune responses (change from day 0)	Baseline HAI
		H3N2		H1N1
		Spearman's r	P value	Spearman's r	P value
LAIV	HAI (day 30)	−.5442	.0023	−.3817	.041
	Effector IgA (day 7)	−.2351	.2195	−.2886	.129
	Effector IgG (day 7)	−.2469	.1966	−.3607	.0545
	Memory IgA (day 30)	−.6746	.0015	−.2916	.2258
	Memory IgG (day 30)	−.1453	.5529	−.2343	.3344
TIV	HAI (day 30)	−.7225	<.0001	−.803	<.0001
	Effector IgA (day 7)	−.3954	.0338	−.489	.0071
	Effector IgG (day 7)	−.3076	.1045	−.3849	.0392
	Memory IgA (day 30)	.1	.723	−.08	.776
	Memory IgG (day 30)	−.2462	.3764	−.4143	.1247