Table 1.

Demographic Characteristics of the Enrolled Study Population

Characteristic	Group 1 (n = 50)	Group 2 (n = 50)	Total
Sex, No. (%)
Male	24	31	55
Female	26	19	45
Age, mean (SD), y	3.2 (1.3)	2.8 (1.3)	3.0 (1.3)
Height, mean (SD), cm	100.3 (11.0)	98.1 (11.6)	99.2 (11.3)
Weight, mean (SD), kg	15.8 (3.1)	15.6 (3.1)	15.7 (3.0)
No. of prior IPVs, No (%)
3	8 (16)	10 (20)	18 (18)
4+	42 (84)	40 (80)	82 (82)
Time since last poliovirus vaccination, No. (%)
≥1 y	43 (86)	36 (72)	79 (79)
<1 y	7 (14)	14 (28)	21 (21)
Time since last poliovirus vaccination for those vaccinated <1 y earlier, mean (SD), mo	6.4 (2.5)	7.2 (2.7)	6.9 (2.6)

Abbreviations: IPV, inactivated poliovirus vaccine; SD, standard deviation.