| Journal of Clinical Medicine Research, ISSN 1918-3003 print, 1918-3011 online, Open Access | 
| Article copyright, the authors; Journal compilation copyright, J Clin Med Res and Elmer Press Inc | 
| Journal website http://www.jocmr.org | 
Letter to the Editor
Volume 10, Number 4, April 2018, pages 363-364
Clinical Significance of Pregnancy in Japanese Women Aged 15 Years
Table
| Prenatal care | Total number | % | Yes number | % | None number | % | 
|---|---|---|---|---|---|---|
| Data are presented as number or percentage. *P < 0.05. | ||||||
| Total | 56 | 49 | 88 | 7 | 13 | |
| Start of prenatal care | ||||||
| First trimester | 13 | 23 | 13 | 27 | - | - | 
| Second trimester | 17 | 30 | 17 | 35 | - | - | 
| Third trimester | 19 | 34 | 19 | 39 | - | - | 
| No prenatal care | 7 | 13 | - | - | 7 | 100 | 
| History of previous pregnancy | 1 | 2 | 1 | 2 | 0 | 0 | 
| History of smoking | 17 | 30 | 15 | 31 | 2 | 29 | 
| Insulated state with parents | 9 | 16 | 2 | 4 | 7 | 100* | 
| Economic problems | 13 | 23 | 6 | 12 | 7 | 100* | 
| Unknown pregnant partner | 19 | 34 | 13 | 27 | 6 | 86* | 
| Chlamydia trachomatis antigen-positive | 17 | 30 | 15 | 31 | 2 | 29 | 
| Condyloma acuminatum | 7 | 13 | 7 | 14 | 0 | 0 | 
| Mental disorders | 1 | 2 | 1 | 2 | 0 | 0 | 
| Hypertensive disorders | 1 | 2 | 1 | 2 | 0 | 0 | 
| Glucose intolerance | 0 | 0 | 0 | 0 | 0 | 0 | 
| Placental abruption | 0 | 0 | 0 | 0 | 0 | 0 | 
| Preterm delivery | 1 | 2 | 1 | 2 | 0 | 0 | 
| Spontaneous delivery | 49 | 88 | 42 | 86 | 7 | 100 | 
| Vacuumextraction/forceps delivery | 7 | 13 | 7 | 14 | 0 | 0 | 
| Breech delivery | 0 | 0 | 0 | 0 | 0 | 0 | 
| Planned cesarean delivery | 0 | 0 | 0 | 0 | 0 | 0 | 
| Emergent cesarean delivery | 0 | 0 | 0 | 0 | 0 | 0 | 
| Low birth weight infant | 0 | 0 | 0 | 0 | 0 | 0 | 
| Neonatal asphyxia | 2 | 4 | 2 | 4 | 0 | 0 | 
| Perinatal death | 1 | 2 | 1 | 2 | 0 | 0 | 
| Postpartum hemorrhage ≥ 1,000 mL | 4 | 7 | 4 | 8 | 0 | 0 |