Table 1 Subject characteristics (n = 1538)
|  | Mean ± SD, median (95% range), or n (%) |  | Mean ± SD, median (95% range), or n (%) |
|---|---|---|---|
Maternal characteristics | Â | Urinary DON examination | Â |
Maternal age (years) | 28.3 ± 3.4 | Season of sample collection |  |
Pre-pregnancy BMI (kg/m2) | 20.9 ± 2.7 |  Spring | 301 (19.6) |
Weight (kg) | 54.8 ± 7.9 |  Summer | 476 (31.0) |
Average personal income (RMB yuan/month) |  |  Autumn | 525 (34.1) |
 < 5000 | 533 (34.7) |  Winter | 236 (15.3) |
 5000–9999 | 675 (43.9) | Creatinine (g/L) | 1.0 ± 0.6 |
  ≥ 10,000 | 304 (19.8) | Total DON |  |
 Missing | 26 (1.7) |  Positive Samples | 1487 (96.7) |
Education attainment (years) |  |  Mean value (ng/mL) | 19.0 ± 20.4 |
  ≤ 12 | 213 (13.9) |  Median value (ng/mL) | 12.1 (1.1, 59.5) |
 13–15 | 388 (25.2) |  Mean value (ng/mg Creatinine) | 20.1 ± 25.2 |
  ≥ 16 | 886 (57.6) |  Median value (ng/mg Creatinine) | 13.5 (1.8, 56.4) |
 Missing | 51 (3.3) | Free DON |  |
Parity (Primiparous) | 1271 (82.6) |  Positive Samples | 1324 (86.1) |
Abnormal Pregnancy-Labor History (Yes) | 570 (37.1) |  Mean value (ng/mL) | 10.2 ± 13.2 |
Morning sickness (Yes) | 1276 (83.0) |  Median value (ng/mL) | 5.1 (ND, 36.2) |
Smoking (Yes) | 99 (6.4) |  Mean value (ng/mg Creatinine) | 9.9 ± 12.8 |
Alcohol intake (Yes) | 71 (4.6) |  Median value (ng/mg Creatinine) | 5.9 (0.4, 29.9) |
Infant characteristics | Â | PDI (ng/kg b.w.) | Â |
Sex (male) | 886(57.6) |  Mean value | 1.0 ± 1.1 |
Gestational age (weeks) | 39.4 ± 1.4 |  Median value | 0.7 (0.1, 3.2) |
Birth weight (g) | 3334.9 ± 445.4 | Exceeding PMTDI | 552 (35.9) |
Birth Length (cm) | 50.1 ± 1.5 |  |  |
SGA (< 10%) | 130 (8.5) |  |  |
Low birth weight (< 2,500 g) | 37 (2.4) |  |  |
Preterm birth (< 37 weeks) | 61 (4.0) |  |  |