Table 1 Demographics Overall Cohort
Overall Cohort | Anaemia HB < 110 g/L | No Anaemia HB ≥110 g/L | p-value | |
|---|---|---|---|---|
Number | 1093 (100.0%) | 168 (18.0%) | 765 (82.0%) | – |
Age (years) | 32.0 (28.2–35.5) | 30.2 (26.1–34.8) | 32.3 (28.8–35.8) | < 0.001 |
Weight (kilograms) | 79.0 (64.0–98.6) | 90.6 (72.0–107.7) | 76.0 (63.0–97.0) | < 0.001 |
Body Mass Index (kg/m2) | 29.5 (24.7–36.3) | 33.0 (27.2–39.4) | 28.7 (24.1–35-6) | < 0.001 |
Body Mass Index Classification | < 0.001 | |||
- Underweight | 40 (3.7%) | 1 (0.6%) | 32 (4.2%) | |
- Normal | 255 (23.3%) | 22 (13.1%) | 197 (25.8%) | |
- Overweight | 275 (25.2%) | 41 (24.4%) | 194 (25.4%) | |
- Obese | 523 (47.8%) | 104 (61.9%) | 342 (44.7%) | |
Ethnicity | < 0.001 | |||
- African | 15 (1.4%) | 1 (0.6%) | 11 (1.4%) | |
- Chinese | 31 (2.8%) | 1 (0.6%) | 23 (3.0%) | |
- Indian | 184 (16.8%) | 14 (8.3%) | 150 (19.6%) | |
- Middle Eastern | 26 (2.4%) | 8 (4.8%) | 17 (2.2%) | |
- NZ European / Pakeha | 242 (22.2%) | 24 (14.3%) | 171 (22.4%) | |
- NZ Maori | 127 (11.6%) | 32 (19.0%) | 74 (9.7%) | |
- Other | 2 (0.2%) | 0 (0.0%) | 1 (0.1%) | |
- Other Asian | 54 (4.9%) | 5 (3.0%) | 43 (5.6%) | |
- Other European | 68 (6.2%) | 4 (2.4%) | 53 (6.9%) | |
- Pacific Islander | 301 (27.6%) | 75 (44.6%) | 185 (24.2%) | |
- South East Asian | 42 (3.8%) | 4 (2.4%) | 36 (4.7%) | |
Prior Pregnancies | ||||
- Gravida | 3 (2–4) | 3 (2–5) | 3 (2–4) | < 0.001 |
- Para | 1 (1–2) | 2 (1–3) | 1 (1–2) | < 0.001 |
Number Prior Caesarean Sections | 1 (0–1) | 1 (0–2) | 1 (0–1) | 0.008 |
Plurality | 0.10 | |||
- Singleton | 1054 (96.4%) | 158 (94.0%) | 738 (96.5%) | |
- Twins | 37 (3.4%) | 9 (5.4%) | 26 (3.4%) | |
- Triplets or above | 2 (0.2%) | 1 (0.6%) | 1 (0.1^) | |
Gestation at Delivery (weeks) | 39.0 (38.3–39.3) | 39.0 (38.1–39.3) | 39.0 (38.3–39.3) | 0.65 |
Singleton Foetal Weight (grams) | 3500 (3170–3890) | 3660 (3330–4010) | 3460 (3140–3850) | < 0.001 |
Preoperative Blood Test Results | ||||
- Haemoglobin Obtained | 933 (85.4%) | 168 (100.0%) | 765 (100.0%) | – |
- Ferritin Obtained | 532 (48.7%) | 103 (61.3%) | 429 (56.1%) | – |
- Haemoglobin and Ferritin Obtained | 532 (48.7%) | 103 (61.3%) | 429 (56.1%) | – |
- Haemoglobin (g/L) | 121 (113–128) | 104 (100–107) | 123 (118–129) | < 0.001 |
- Haemoglobin < 120 g/L | 424 (38.8%) | 168 (100.0%) | 256 (33.5%) | < 0.001 |
- Ferritin (mcg/L) | 19 (11–32) | 13 (7–21) | 21 (13–34) | < 0.001 |
- Ferritin < 30mcg/L | 266 (49.9%) | 83 (80.6%) | 287 (66.9%) | < 0.001 |