Table 1.

Iron depletion based on serum ferritin (<12 μg/L) in adolescent girls with and without menses.

Iron status	Girls without menses	Girls with menses	P
	n = 948	n = 274
Normal iron status	797 (84.1%)	182 (66.5%)	0.001
Iron depletion	151 (15.9%)	92 (33.5%)

All data are presented as frequencies and proportions (%).

*Derived from Pearson's chi-square test.