No Relationship between Maternal Iron Status and Postpartum Depression in Two Samples in China

Table 3

Maternal iron status in the confirmatory sample (mid- and late pregnancy, 3 days postpartum).

Iron measure	Mid pregnancy	Late pregnancy	3 days postpartum
	(𝑛=567)^a	(𝑛=557)^b	(𝑛=265)
Hemoglobin, g/L	121.5±9.8	114.7±9.9	104.2±11.2^c
MCV, fl	85.1±4.8	84.8±4.7	78.9±8.3^d
ZPP, 𝜇mol/mol	54.9±31.6	88.4±44.2^e	—
Ferritin, ng/mL	41.9±35.3	14.1±13.8^e	—
sTfR, nmol/L	15.6±5.3	30.6±10.7^e	—
sTfR Index	11.6±7.4	31.9±17.0^e

^aZPP values were available for 330 subjects.
^bZPP values were available for 452 subjects, ferritin and sTfR for 543 subjects.
^cSignificant differences were found between the 3 measures, 𝑃<0.001.
^dSignificant differences were found between the 3 measures: mid pregnancy compared to late pregnancy, 𝑃<0.05; mid pregnancy and late pregnancy compared to postpartum, 𝑃<0.001.
^eSignificant differences were found between the 2 measures, 𝑃<0.001.