Table 2. Comparison of pre-existing antibody titers between case and control groups.

Antibody titers	Case group (Median (min–max))	Control group (Median (min–max))	p
Measles Ig G titers	9,632.50 (263.60–453,221.00)	6,919.75 (201.60–38,133.00)	0.207
Rubella Ig G titers	95.10 (1.30–300.90)	159.30 (17.80–1,833.40)	0.003
Mumps Ig G titers	1,194.00 (291.40–9,445.30)	986.90 (62.20–4,177.30)	0.251
Pneumococcus Ig G titers	0.79 (0.16–9.53)	2.30 (0.08–10.03)	0.002
DiphtheriaIg G titers	0.23 (0.01–1.38)	0.19 (0.03–1.77)	0.895
B. PertussisIg G titers	20.50 (4.50–511.20)	78.35 (1.70–693.50)	<0.0001
TetanusIg G titers	1.20 (0.00–9.70)	0.55 (0.00–24.30)	0.489
Varicella Ig G titers	2.95 (0.66–6.28)	2.92 (0.47–5.77)	0.813
H. influenza BIg G titers	68.40 (5.00–1,522.60)	51.55 (7.00–407.50)	0.055

Notes:

min: minimum; max: maximum.

The parameters that were statistically significant in the comparison of the groups were indicated with bold.