Overall Cohort with Valid HB and Ferritin | IDA HB < 110 g/L Ferritin < 30mcg/L | NAID HB ≥110 g/L Ferritin < 30mcg/L | Normal HB ≥110 g/L Ferritin ≥30mcg/L | p-values | |
---|---|---|---|---|---|
Number | 512 (100.0%) | 83 (16.2%) | 287 (56.1%) | 142 (27.7%) | – |
Age (years) | 32.3 (28.1–35.8) | 29.8 (26.0–33.8) | 32.4 (28.6–36.1) | 32.6 (29.1–35.6) | 0.002 a 0.001 b 1.00 c |
Weight (kilograms) | 76.1 (63.5–100.0) | 87.2 (73.0–102.5) | 76.0 (64.0–102.2) | 72.3 (61.5–93.0) | 0.009 a 0.19 b 0.24 c |
Body Mass Index (kg/m2) | 28.9 (24.9–36.6) | 32.9 (27.1–37-6) | 28.7 (24.3–36.7) | 27.2 (24.3–33.5) | 0.001 a 0.008 b 0.70 c |
Body Mass Index Classification | |||||
- Underweight | 26 (5.1%) | 1 (1.2%) | 16 (5.6%) | 9 (6.3%) | 0.002 a |
- Normal | 110 (21.5%) | 9 (10.8%) | 66 (23.0%) | 35 (24.6%) | 0.006 b |
- Overweight | 138 (27.0%) | 20 (24.1%) | 77 (26.8%) | 41 (28.9%) | 0.85 c |
- Obese | 238 (46.5%) | 53 (63.9%) | 128 (44.6%) | 57 (40.1%) | |
Ethnicity | |||||
- African | 3 (0.6%) | 0 (0.0%) | 1 (0.3%) | 2 (1.4%) | 0.001 a |
- Chinese | 16 (3.1%) | 0 (0.0%) | 7 (2.4%) | 9 (6.3%) | 0.009 b |
- Indian | 92 (18.0%) | 11 (13.3%) | 51 (17.8%) | 30 (21.1%) | 0.09 c |
- Middle Eastern | 15 (2.9%) | 5 (6.0%) | 6 (2.1%) | 4 (2.8%) | |
- NZ European / Pakeha | 98 (19.1%) | 10 (12.0%) | 65 (22.6%) | 23 (16.2%) | |
- NZ Maori | 63 (12.3%) | 16 (19.3%) | 35 (12.2%) | 12 (8.5%) | |
- Other | 1 (0.2%) | 0 (0.0%) | 1 (0.3%) | 0 (0.0%) | |
- Other Asian | 24 (4.7%) | 3 (3.6%) | 14 (4.9%) | 7 (4.9%) | |
- Other European | 27 (5.3%) | 1 (1.2%) | 19 (6.6%) | 7 (4.9%) | |
- Pacific Islander | 147 (28.7%) | 36 (43.4%) | 77 (26.8%) | 34 (23.9%) | |
- South East Asian | 26 (5.1%) | 1 (1.2%) | 11 (3.8%) | 14 (9.9%) | |
Prior Pregnancies | |||||
- Gravida | 3 (2–4) | 3 (2–5) | 3 (2–4) | 2 (2–3) | 0.007 a 0.91 b 0.01 c |
- Parity | 1 (1–2) | 2 (1–3) | 1 (1–2) | 1 (1–2) | 0.001 a 0.42 b 0.009 c |
Number Prior Caesarean Sections | 1 (0–2) | 1 (0–2) | 1 (0–2) | 1 (0–1) | 0.08 d |
Plurality | |||||
- Singleton | 485 (94.7%) | 78 (94.0%) | 273 (95.1%) | 134 (94.4%) | 1.00 a |
- Twins | 26 (5.1%) | 5 (6.0%) | 1 (0.3%) | 8 (5.6%) | 0.74 b |
- Triplets or above | 1 (0.2%) | 0 (0.0%) | 13 (4.5%) | 0 (0.0%) | 0.69 c |
Gestation at Delivery (weeks) | 38.5 (38.1–39.3) | 39.0 (38.1–39.4) | 39.0 (38.1–39.3) | 38.8 (38.0–39.1) | 0.06 d |
Singleton Foetal Weight (grams) | 3470 (3130–3860) | 3640 (3190–3960) | 3510 (3140–3930) | 3330 (3040–3690) | 0.002 a 0.46 b 0.01 c |
Preoperative Blood Test Results | |||||
- Haemoglobin Result Obtained | 512 (100.0%) | 83 (100.0%) | 287 (100.0%) | 142 (100.0%) | – |
- Haemoglobin (g/L) | 121 (113–128) | 104 (101–107) | 122 (116–129) | 125 (118–131) | < 0.001 a < 0.001 b 0.16 c |
- Haemoglobin < 120 g/L | 241 (47.1%) | 83 (100.0%) | 115 (40.1%) | 43 (30.3%) | < 0.001 a < 0.001 b 0.06 c |
- Ferritin Result Obtained | 512 (100.0%) | 83 (100.0%) | 287 (100.0%) | 142 (100.0%) | – |
- Ferritin (mcg/L) | 19 (11–31) | 10 (7–16) | 15 (10–21) | 41 (34–63) | < 0.001 a 0.001 b < 0.001 c |
- Ferritin < 30mcg/L | 370 (72.2%) | 83 (100.0%) | 287 (100.0%) | 0 (0.0%) | – |