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Table 1 Participant characteristics at first hospital appointment. Values are mean (SD), or number and percentage

From: The prevalence of perioperative iron deficiency anaemia in women undergoing caesarean section—a retrospective cohort study

Characteristic Whole group GROUP 1
No anaemia at first hospital appointment
Hb
≥ 130 g/L
N=204
GROUP 2
Mild anaemia at first hospital appointment
Hb
110 - 129 g/L
N=242
GROUP 3
Moderate anaemia
at first hospital appointment
Hb
80 - 109 g/L
N=33
P value*
First hospital appointment - Gestation (weeks) 9.9 (7.3) 6.8 (3.6) 11.4 (7.8) 18.4 (9.8) <0.0001
First hospital appointment - Haemoglobin concentration (g/L) 126.7 (11.4) 137.0 (5.9) 121.2 (5.3) 103.2 (6.6) N/A
First hospital appointment – Women with anaemia, Hb < 130 g/L (n,%)* 275/479 (57.4%) 0 242/479 (50.5%) 33/479 (6.9%) N/A
Iron deficiency (ferritin <30 μg/L) 148/437(33.9%) 41/189 (21.7%)@ 89/219 (40.6%) 18/29 (62.1%) <0.0001
Twin pregnancy 24 9 12 3 N/A&
Abnormal placentation including placenta praevia 10 3 5 2 N/A&
Age (years)# 32.5 (5.2) 32.8 (5.1) 32.5 (5.2) 30.6 (5.4) 0.0780
First hospital appointment - Height (cm) 162.9 (7.44) 162.9 (7.7) 163.0 (7.5) 162.6 (5.1) 0.9625
First hospital appointment - Weight (kg) 70.1 (16.8) 70.6 (16.0) 70.0 (18.0) 68.6 (14.4) 0.8275
First hospital appointment - Body mass index (kg/m2) 26.3 (5.9) 26.5 (5.9) 26.2 (5.9) 26.0 (5.4) 0.8240
  1. *Difference between Group 1,2 and 3
  2. This table shows the data for the whole group, at first hospital appointment, with women divided into three groups based on first hospital appointment haemoglobin concentration measurement. In the anaemia groups, four women had thalassemias, and one woman had systemic lupus erythematosus.
  3. *Four hundred eighty-nine women were included in the total group, however, 10 patients did not have a haemoglobin concentration measurement at first hospital appointment therefore anaemia proportion is out of 479 women. Ferritin levels were measured in 437 of these women.
  4. N/A = not applicable as participants were divided into three groups depending on their first hospital haemoglobin concentration measurement so they are expected to be different.
  5. #age at caesarean section.@ These 41 people were iron deficient without anaemia (ferritin < 30 μg/L). This is also shown in Fig. 1.
  6. &numbers too small to compare