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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
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Perioperative Medicine

ISSN: 2047-0525