Table 1.
Anamnestic and clinical characteristics of the study participants (n = 72).
| Age (Years) | 29.91 ± 3.64 |
| Gestational age between 20th and 25th week | 21 (29.2%) |
| Gestational age between 25th and 30th week | 27 (37.5%) |
| Gestational age between 30th and 35th week | 22 (30.6%) |
| Gestational age over 35th week | 2 (2.8%) |
| Previous pregnancy | 36 (50.0%) |
| - one full-term pregnancy | 25 (69.4%) |
| - between 2 and 3 full-term pregnancies | 9 (12.5%) |
| - more than 3 full-term pregnancies | 2 (5.6%) |
| - complications | 5 (13.9%) |
| - miscarriages | 13 (36.1%) |
| - single pregnancies | 29 (80.6%) |
| - twin pregnancies | 7 (19.4%) |
| - natural birth | 30 (83.3%) |
| - caesarean section | 6 (16.7%) |
| - preterm birth | 5 (13.9%) |
| PBLW risk factors | 40 (55.6%) |
| Smokers | 7 (9.7%) |
| Drink alcohol | 0 (0%) |
| Supplementation with fluorides | 4 (15.4%) |
| (25(OH)vit. D) serum levels | 20.51 ± 6.7 |
| 25(OH)vit. D < 30 ng/mL | 65 (90.3%) |
| 25(OH)vit. D < 20 ng/mL | 32 (44.4%) |
Continuous variables are expressed as means ± standard deviations; categorical variables are expressed as counts/percentages. Abbreviations: PBLW= preterm birth plus low weight; 25(OH)vit. D = 25-hydroxy-vitamin D.