First Trimester Ferritin Is Superior over Soluble Transferrin Receptor and Hepcidin in Predicting Anemia in the Third Trimester: Result from a Cohort Study in Indonesia

Table 2

Diagnostic study results on the ferritin level in the first trimester to predict anemia in the third trimester.

Variable classification	Ferritin and anemia
Sample size	181
Positive group	57 (31.49%)
Negative group	124 (68.51%)
Area under the ROC curve (AUC)	0.672
Standard error	0.0448
95% confidence interval	0.598 to 0.739
z statistic	3.829
Significance level (area = 0.5)	0.0001
Youden index J	0.2840
Associated criterion	≤27.23
Sensitivity	42.11
Specificity	86.29
Likelihood ratio (+) (95% CI)	3.07 (1.8–5.3)
Likelihood ratio (−) (95% CI)	0.67 (0.5–0.8)