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Table 2 Total population changes in haemoglobin concentration between the first and 3rd trimesters and stratified sub-groups by ethnicity, deprivation and body size as represented by the body mass index (BMI). ΔHB(%) – represents the absolute change in haemoglobin and the percentage change in brackets

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)
South Asians a 1097 123.4 10.9 117–130 104/140 1042 110.8 11.13 104–119 93/128 −12.6(10.2)
Blacks a 294 121.5 11.4 115–129 102/139 274 109.6 9.77 104–116 93/125 −11.9(9.8)
Mixeda 76 127.8 8.53 122–133 113/142 74 111.0 8.48 105–118 97/125 −16.8(13.4)
White a 4405 129 10.6 123–136 112/144 4191 114.9 9.81 109–121 98/131 −14.1(10.9)
Subgroup H b 5663 128 10.3 122–135 111/144 5298 114 9.8 108–121 98/130 −14(10.9)
Subgroup I c 728 117 12.7 109–126 95/136 676 108 12.1 100–116 88/128 −9(7.7)
IMD Q1 (most deprived) 3957 126 11.3 120–134 107/143 3720 112.8 10.5 106–120 95/129 −9(7.7)
IMD Q2 1074 126.9 11.7 122–134 107/143 1011 113.7 10.2 108–120 96/130 −13.2(10.4)
IMD Q3 778 128 10.1 122–135 110/144 739 115 9.8 109–121 99/131 −13(10.1)
IMD Q4 741 128 10.7 122–135 111/144 695 115.5 9.7 109–122 99/131 −12.5(9.8)
IMD Q5 (least deprived) 455 128.5 10.5 123–135 114/144 438 115.7 9.2 110–121 101/131 −12.8((9.3)
IMD Q1 a 1037 128.9 9.06 123–135 114/144 1008 113.8 9.79 108–121 97/129 −15.1(11.7)
IMD Q2&3 a 4273 126.6 11.27 120–134 107/143 4025 112.9 10.49 106–120 95/129 −13.7(10.8)
IMD Q 4&5 a 918 128.6 10.4 123–135 111/144 871 115.6 9.49 109–122 100/131 −13(10.1)
BMI Obese 1711 128.8 10.8 123–136 110/145 1604 115.8 9.8 110–122 99/132 −13(16.7)
BMI Underweight 231 124.5 10.9 117–132 107/141 222 110.5 11.5 104–117 89/128 −14(17.3)
BMI normal+overweight 4946 126.5 11.2 121–134 107/143 4678 113.1 10.3 107–120 96/129 −13.4(16.9)
IMD1 excluding obese 2832 125.8 11.4 120–133 106/142 2679 111.9 10.6 105–119 94/129 −13.9 (17.4)
  1. Each subgroup represents the total population excluding the women as shown by the symbols below
  2. 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
  3. b women without a haemoglobinopathy trait
  4. c Women with an haemoglobinopathy trait
  5. IMD = Index of multiple deprivation
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