Table 1.
Demographic characteristics of the study population (N = 1,058)
| Characteristics | Summary |
|---|---|
| Age (years) | 30.2 ± 4.0 |
| Preconception BMI (kg/m2) | 21.0 ± 2.8 |
| <18.5 | 170 (16.1) |
| 18.5–24 | 748 (70.7) |
| >24 | 140 (13.2) |
| Family history of diabetes [n (%)] | |
| Yes | 410 (38.7) |
| No | 648 (61.3) |
| Smoking exposure [n (%)] | |
| Yes | 165 (15.6) |
| No | 893 (84.4) |
| Alcohol consumption [n (%)] | |
| Yes | 142 (13.4) |
| No | 916 (86.6) |
| FAS [n (%)] | |
| Compound vitamin supplements | 650 (61.4) |
| Folic acid tablet | 24 (2.3) |
| No | 384 (36.3) |
| RBC folate (ng/mL) | 385.92 (290.0–529.7) |
| <400 | 557 (52.6) |
| 400–600 | 301 (28.5) |
| ≥600 | 200 (18.9) |
| Serum folate (ng/mL) | 14.39 (12.6–16.8) |
| <25.5 | 1,045 (98.8) |
| ≥25.5 | 13 (1.2) |
| Vitamin B12 (pg/mL) | 405.93 (298.0–485.0) |
| <200 | 113 (10.7) |
| ≥200 | 945 (89.3) |
Continuous variables are presented as means ± SD or median (interquartile range), and categorical variables are listed as n (%). No missing data existed in the current analysis.