Table 3. Predictors of Seroprotection (Titer ≥1∶40) after Influenza Vaccination by Influenza Strain (Univariable Analyses).

	Seroprotection (Post Vaccination Antibody Titer ≥1∶40)
	A/Brisbane/10/2007		A/Brisbane/59/2007		B/Brisbane/60/2008
	[H3N2]		[H1N1]
	OR (95% CI)	p-value	OR (95% CI)	p-value	OR (95% CI)	p-value
Age (per 1 year change)	0.94 (0.86 1.02)	0.128	0.96 (0.87, 1.06)	0.389	0.99 (0.86, 1.15)	0.930
<5 years	0.58 (0.27, 1.25)	0.166	0.61 (0.20, 1.82)	0.606	0.92 (0.26, 3.23)	0.893
5–9 years	0.63 (0.37, 1.07)	0.088	0.67 (0.34, 1.28)	0.665	1.23 (0.60, 2.50)	0.571
>9 years	Reference
Male	1.17 (0.55, 2.49)	0.685	0.57 (0.29, 1.12)	0.104	0.93 (0.44, 1.98)	0.855
Comorbidity	1.59 (0.49, 5.20)	0.443	0.59 (0.26, 1.33)	0.202	0.19 (0.03, 1.42)	0.189
Log serum 25(OH)D	1.52 (0.69, 3.34)	0.295	1.42 (0.52, 3.91)	0.495	0.85 (0.29, 2.54)	0.771
Vitamin D Deficiency
AAP<50	0.72 (0.48, 1.06)	0.097	0.84 (0.44, 1.59)	0.587	0.97 (0.41, 2.31)	0.942
CPS<75	0.92 (0.50, 1.70)	0.781	0.79 (0.34, 1.83)	0.589	0.80 (0.47, 1.34)	0.392