Table 1. Background characteristics of children and their mothers in Okinawa, Japan.

Characteristics	Mean (SD) or number (%)
Number of children	117,175
Number of male children	60,167 (51.4)
Birth weight, g	3014 (434)
Gestational age, weeks	38.0 (5.6)
Age of mother when child is 3 months, years	29.7 (5.6)
Order of birth	1.9 (1.0)
Number of teeth at 18 months	14.5 (2.7)
Number of children with caries at 3 years	53,924 (46.0)
Number of neonates born with macrosomia 1	1266 (1.1)

¹ Macrosomia was identified as a birth weight ≥4000 g