Table 3.
Frequencies and prevalence of anemia and IDA
| Outcomes | Sample | Total (n, %) | First trimester (n,%) |
Second trimester (n,%) |
Third trimester (n,%) |
P value1 |
|---|---|---|---|---|---|---|
| Anemia | All pregnancies | 2460 (19.84) | 50 (4.91) | 577 (16.55) | 1833 (23.21) | < 0.001 |
| Singletons | 2379 (19.63) | 49 (4.92) | 547 (16.23) | 1783 (23.00) | < 0.001 | |
| Multiple gestations | 81 (28.72) | 1 (4.55) | 30 (26.09) | 50 (34.48) | 0.011 | |
| Maternal age < 35 | 2055 (19.40) | 42 (4.70) | 477 (16.04) | 1536 (22.83) | < 0.001 | |
| Maternal age ≥ 35 | 405 (22.40) | 8 (6.40) | 100 (19.49) | 297 (25.38) | < 0.001 | |
| Nullipara | 1520 (18.39) | 31 (4.36) | 372 (16.25) | 1117 (21.22) | < 0.001 | |
| Multipara | 940 (22.73) | 19 (6.23) | 205 (17.13) | 716 (27.19) | < 0.001 | |
| IDA | All pregnancies | 1720 (13.87) | 20 (1.96) | 293 (8.41) | 1407 (17.82) | < 0.001 |
| Singletons | 1662 (13.72) | 19 (1.91) | 276 (8.19) | 1367 (17.63) | < 0.001 | |
| Multiple gestations | 58 (20.57) | 1 (4.55) | 17 (14.78) | 40 (27.59) | 0.006 | |
| Maternal age < 35 | 1449 (13.68) | 17 (1.90) | 247 (8.31) | 1185 (17.62) | < 0.001 | |
| Maternal age ≥ 35 | 271 (14.99) | 3 (2.40) | 46 (8.97) | 222 (18.97) | < 0.001 | |
| Nullipara | 1031 (12.47) | 10 (1.40) | 174 (7.40) | 847 (16.09) | < 0.001 | |
| Multipara | 689 (16.66) | 10 (3.28) | 119 (9.94) | 560 (21.27) | < 0.001 | |
| Previously clinician-diagnosed IDA | All pregnancies | 3796 (30.61) | 53 (5.21) | 594 (17.03) | 3149 (39.87) | < 0.001 |
| Singletons | 3699 (30.52) | 52 (5.22) | 564 (16.73) | 3083 (39.77) | < 0.001 | |
| Multiple gestations | 97 (34.52) | 1 (4.55) | 30 (26.09) | 66 (45.52) | < 0.001 | |
| Maternal age < 35 | 3226 (30.45) | 48 (5.38) | 510 (17.15) | 2668 (39.66) | < 0.001 | |
| Maternal age ≥ 35 | 570 (31.53) | 5 (4.00) | 84 (16.37) | 481 (41.11) | < 0.001 | |
| Nullipara | 2415 (29.21) | 37 (5.19) | 360 (15.72) | 2081 (38.33) | < 0.001 | |
| Multipara | 1381 (33.40) | 16 (5.25) | 234 (19.55) | 1131 (42.95) | < 0.001 |
1From Pearson’s chi-square test
IDA iron deficiency anemia