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Table 3 Demographics of Patients with Valid Haemoglobin and Ferritin Recordings

From: Incidence and predictors of iron deficiency anaemia in parturients undergoing elective caesarean section at a tertiary hospital in New Zealand: a retrospective, observational cohort study

 

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%)

  1. This table shows the demographic data for all those with both a valid HB and ferritin recording, 512 in total. The incidence of IDA amongst this group was 16.2%. The demographic parameters on the left are compared between the overall cohort and those with IDA, NAID and normal blood results
  2. Abbreviations – IDA – iron deficiency anaemia; NAID – non anaemic iron deficiency
  3. Data presented as number (percent) or median (interquartile range) as appropriate
  4. Sidak correction for multiple tests – revised p-value for statistical significance becomes 0.0037 – significant results highlighted in bold
  5. a iron deficiency anaemia versus normal b iron deficiency anaemia versus non anaemic iron deficiency c non anaemic iron deficiency versus normal
  6. d no significant difference – multiple testing not completed