Table 3. Perinatal outcomes at ≥ 22 weeks of gestation of the syphilis-infected women by maternal age in 2022 in Japan.

Data are presented as number (percentage).

*Congenital syphilis in surviving neonates.

Maternal age (y)	Total number	Premature delivery	Intrauterine fetal demise	Congenital syphilis*
≤ 19	18	1 (6%)	0 (0%)	1 (6%)
20-29	237	20 (8%)	8 (3%)	18 (8%)
30-39	108	8 (7%)	0 (0%)	9 (8%)
≥ 40	8	4 (50%)	1 (13%)	0 (0%)
Unknown	4	0 (0%)	0 (0%)	0 (0%)
Total	375	33 (9%)	9 (2%)	28 (7%)