Table 4.

Pairwise comparison of placental TAC levels.

	First trimester	Second trimester	Third trimester
	Test score, P value	Test score, P value	Test score, P value
First trimester	—	2394.0, 0.558	1327.5, 0.0001
Second trimester		—	535.0, 0.0001
Third trimester			—

TAC: total antioxidant capacity; the nonparametric Mann-Whitney U test was applied.

Significant differences were noted between first and third trimester (P < 0.0001) and second and third trimester (P < 0.0001) groups. The difference in TAC levels between first and second trimester groups was not significant.