Table 1.

Baseline Characteristics of the Study Participants

Characteristic	Statistic
Index children (n = 53)
Age distribution, No. (%)
0 to <3 mo	22 (41.5)
3 to <6 mo	17 (32.1)
6 to <12 mo	7 (13.2)
1 to <2 y	5 (9.4)
≥2 y	2 (3.8)
Male sex, No. (%)	31 (58.5)
Siblings (n = 46)
Age, median (range), y	4.7 (1.4–15.8)
Male sex, No. (%)	23 (50.0)
Parents (n = 100)
Age, median (range), y	30.2 (18.3–50.2)
Male sex, No. (%)	48 (48.0)