| 妊娠阶段 | Hb (g/L) | 轻度贫血 | 中度贫血 | 重度贫血 | 极重度贫血 | 合计 |
| 孕早期(n = 21) | 128 ± 9.17 | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) |
| 孕中期(n = 49) | 117 ± 9.36* | 6 (12.2) | 2 (4.1) | 0 (0) | 0 (0) | 6 (16.3)* |
| 孕晚期(n = 259) | 116 ± 8.78* | 45 (17.4) | 8 (3.1) | 0 (0) | 0 (0) | 53 (20.5)* |
| F/χ2 | 4.183 |
|
|
|
| 6.793 |
| P | 0.028 |
|
|
|
| 0.033 |