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Table 2 Average hemoglobin and serum ferritin levels of participants by trimesters

From: Prevalence of anemia and iron deficiency anemia in Chinese pregnant women (IRON WOMEN): a national cross-sectional survey

Indicator Sample Total First trimester Second trimester Third trimester P value
Hemoglobin:
mean (SD)
All pregnancies 118.38 (11.52) 126.78 (10.20) 118.93 (11.27) 117.06 (11.32) < 0.0011
Singletons 118.43 (11.49) 126.86 (10.23) 118.99 (11.25) 117.10 (11.26) < 0.0011
Multiple gestations 116.47 (12.88) 123.44 (7.91) 117.17 (11.73) 114.86 (13.98) 0.011
Serum ferritin:
median (lower quartile-upper quartile)
All pregnancies 20.60 (11.79–36.97) 54.39 (34.5–94.01) 28.60 (16.40–50.50) 16.70 (10.20–27.00) < 0.0012
Singletons 20.57 (11.7–36.80) 54.20 (34.37–93.35) 28.74 (16.40–50.49) 16.63 (10.20–26.9) < 0.0012
Multiple gestations 23.65 (13.9–44.44) 75.7 (35.30–125.6) 25.0 (13.9–55.25) 19.7(12.1–35.00) < 0.0012
  1. 1From One-way ANOVA
  2. 2From Kruskal-Wallis rank test