Prevalence, risk factors and associated adverse pregnancy outcomes of anaemia in Chinese pregnant women: a multicentre retrospective study

Table 4 Maternal characteristics of the selected population. Data expressed as the means ± SDs or n (%)

Variables	Anaemic	Non-anaemic	Total
Haemoglobin (g/L)	103.31 ± 5.88	130.55 ± 8.89	129.80 ± 9.88
Gestation week (weeks)	11.32 ± 2.38	10.63 ± 2.73	10.65 ± 2.72
Maternal age (years)	29.91 ± 4.43	30.02 ± 3.93	30.01 ± 3.94
Gravidity	1.96 ± 1.21	1.77 ± 1.09	1.78 ± 1.10
Parity	0.83 ± 0.72	0.51 ± 0.63	0.52 ± 0.63
Pre-pregnancy BMI (kg/m²)	20.34 ± 3.88	21.23 ± 4.13	21.20 ± 4.13
Pre-pregnancy height (cm)	160.45 ± 4.67	161.77 ± 4.91	161.74 ± 4.91
Pre-pregnancy weight (kg)	53.00 ± 7.64	56.13 ± 8.76	56.05 ± 8.75