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Table 1 Total population changes in haemoglobin concentration between the first and 3rd trimesters and stratified sub-groups by distribution of haemoglobin

From: The change in haemoglobin concentration between the first and third trimesters of pregnancy: a population study

 

1st Trimester Hb

3rd Trimester Hb

Sample

N

mean

SD

IQ

5/95%

N

mean

SD

IQ

5/95%

ΔHB(%)

Total Population

7054

127.9

11.2

121–134

108/143

6642

113.7

10.3

107–121

96/130

−14.2(11)

Population 5th- 95th centile

6078

127.0

7.9

122–133

 

5745

113.0

9.5

117–120

 

−14.4 (11.3)

Subgroup A ƒ

4224

130

8.8

124–136

116/144

4028

115.6

9.2

110–122

101/131

−14.4 (11.0)

Subgroup B ƒƒ

5876

129.4

8.8

123–135

115/144

5476

114.7

9.6

109–121

99/130

−14.7(11.4)

Subgroup C 5th -95th centile &a

1958

128.1

7.86

123–134

115/140

1855

114.2

9.4

108–121

98/129

−13.9(10.9)

Subgroup D 5th–100th centile &a

2103

129.4

9.18

123–136

114/144

2035

114.8

9.75

109–121

98/130

−14.6(11.3)

Subgroup E = < 5 centile &a

78

98.7

9.59

95–106

74/107

57

108.8

12.7

99–119

89/128

+ 10.1(10.2)

Subgroup F 5th–95th centile &a

1303

130

7.0

126–136

118.141

1303

118

6.2

114–123

110/130

−10.2 (7.8)

Subgroup EG > 95th centile &a

145

147.8

5.07

144–149

1143/158

180

121.2

11.03

114–137

103/137

−26.6(18.0)

  1. ΔHB(%) – represents the absolute change in haemoglobin and the percentage change in brackets
  2. Each subgroup represents the total population excluding the women as shown by the symbols below
  3. a Restricting the sample to pregnant women without the following problems during index pregnancy current pregnancy problems, pregnancy induced hypertension, Pre-term birth, antepartum haemorrhage, pre-pregnancy med problems, diabetes, hypertension, renal disease, & anaemia in 1st trimester
  4. ƒ excludes anaemic women and women with a serum ferritin <30mcg/L in the first trimester
  5. ƒƒexcludes anaemic women and women with a serum ferritin <15mcg/L in the first trimester