Table 1

Haematological variables by group

	Baseline (A)	2nd Trimester (B)	3rd Trimester (C)	Relative change B–A	p Value*	Relative change C–A	p Value*	Relative change C–B	p Value*
Haemoglobin (g/dl)
Control	12.7 (9.1)	11.7 (7.0)	11.9 (7.7)	−10.5%	<0.001	−8.0%	<0.001	2.54%	0.005
Intervention	13.1 (8.6)	11.9 (7.3)	12.2 (8.2)	−12.1%	<0.001	−8.9%	<0.001	3.24%	0.019
p Value†	0.022	0.132	0.070	0.462		0.437		0.226
Haematocrit (%)
Control	38.1 (2.6)	34.3 (2.1)	34.8 (2.5)	−3.8%	<0.001	−3.2%	<0.001	0.51%	0.156
Intervention	39.0 (2.4)	35.3 (2.3)	36.1 (2.4)	−3.7%	<0.001	−2.9%	<0.001	0.85%	0.061
p Value†	0.034	0.011	0.002	0.906		0.389		0.458
Mean corpuscular volume (fl)
Control	89.4 (4.2)	91.8 (3.7)	92.2 (4.3)	2.4%	<0.001	2.8%	<0.001	0.37%	>0.1
Intervention	88.8 (3.8)	91.4 (4.2)	91.4 (4.3)	2.6%	<0.001	2.6%	<0.001	−0.08%	>0.1
p Value†	0.381	0.589	0.263	0.738		0.734		0.505
Mean corpuscular haemoglobin (pg)
Control	30.0 (1.6)	31.4 (1.6)	31.7 (1.4)	1.4%	<0.001	1.7%	<0.001	0.31%	>0.1
Intervention	30.7 (7.4)	30.9 (1.4)	31.0 (1.4)	0.2%	>0.1	0.3%	>0.1	0.17%	>0.1
p Value†	0.4	0.044	0.005	0.174		0.123		0.552
Mean corpuscular haemoglobin concentration (g/dl)
Control	33.6 (0.9)	34.2 (0.9)	34.4 (1.1)	0.6%	<0.001	0.8%	<0.001	0.24%	>0.1
Intervention	33.6 (0.8)	33.8 (0.7)	33.9 (0.9)	0.1%	>0.1	0.3%	>0.1	0.16%	>0.1
p Value†	0.620	0.007	0.007	0.006		0.234		0.568
Iron (μg/dl)
Control	89.6 (32.7)	68.5 (25.7)	71.9 (21.8)	−21.1%	<0.001	−17.7%	<0.001	3.4%	>0.1
Intervention	104.3 (41.2)	76.5 (31.1)	83.4 (27.7)	−27.8%	<0.001	−20.9%	<0.001	6.9%	0.017
p Value†	0.022	0.097	0.007	0.048		0.509		0.274

Values are mean (SD). *p Value for within-group comparisons; †p value for between-group comparisons.