Table 1 The serum 25(OH)D concentration of pregnant women in early pregnancy stratified by different characteristics
Characteristics | Serum 25(OH)D (ng/mL) | |||||
|---|---|---|---|---|---|---|
Mean | P | Deficiency (< 20.0) | Insufficiency (20.0-29.9) | Sufficiency (≥30.0) | P | |
Total | 19.6±7.5 |  | 4152 (53.1) | 3011 (38.5) | 653 (8.4) |  |
Maternal age (Years) | ||||||
 < 25 | 18.5±7.4 | < 0.001 | 212 (61.3) | 109 (31.5) | 25 (7.2) | < 0.001 |
 25 - 34 | 19.5±7.4 | 3305 (53.4) | 2397 (38.7) | 489 (7.9) | ||
 ≥35 | 20.3±7.7 | 635 (49.6) | 505 (39.5) | 139 (10.9) | ||
Parity (Number of deliveries) | ||||||
 0 | 19.5±7.4 | 0.002 | 3218 (54.0) | 2274 (38.1) | 469 (7.9) | 0.003 |
 ≥1 | 20.0±7.7 | 934 (50.4) | 737 (39.7) | 184 (9.9) | ||
Prepregnancy BMI (kg/m2) |  |  | 21.4±3.0 | 21.3±2.8 | 20.9±2.6 | < 0.001 |
 < 18.5 | 19.8±7.7 | 0.004 | 585 (52.9) | 412 (37.3) | 108 (9.8) | 0.002 |
 18.5 - 23.9 | 19.7±7.6 | 2904 (52.6) | 2132 (38.6) | 481 (8.7) | ||
 24.0 - 27.9 | 19.3±6.8 | 513 (54.3) | 380 (40.2) | 52 (5.5) | ||
 ≥28.0 | 18.1±6.5 | 150 (60.2) | 87(34.9) | 12 (4.8) | ||
Season at time of blood sampling | ||||||
 Spring | 22.9±7.1 | < 0.001 | 431 (38.5) | 523 (46.7) | 165 (14.7) | < 0.001 |
 Summer | 22.4±6.4 | 1095 (37.3) | 1515 (51.6) | 328 (11.2) | ||
 Autumn | 18.6±7.3 | 814 (58.3) | 487 (34.9) | 96 (6.9) | ||
 Winter | 15.1±6.6 | 1812 (76.7) | 486 (20.6) | 64 (2.7) | ||