TABLE I. Characteristics of volunteers before vaccination according to the type of vaccine.

	Vaccine		Total (n = 1,966)
	17D-213/77 (n = 981)	17DD (n = 985)
Gender (% male)	50.6	51.1	50.8
Age [(months) median (max; min)]	9 (8; 22)	9 (8; 21)	9 (8; 22)
Birth weight [(g) mean (standard deviation)]	3,129 (516)	3,143 (500)	3,136 (508)
Current weight [(g) mean (SD)]	9,077 (1290)	9,148 (3259)	9,112 (2477)
Seropositivitya PRE-vaccine [n (%)]	92 (9.4)	84 (8.5)	176 (8.9)
Maternal seropositivitya [n (%)] (n = 1,714)	676 (79.5)	672 (77.8)	1,348 (78.6)

a: antibody titre ≥ 2.80 mIU/mL; SD: standard deviation.