Table 7. Areas under the receiver operating curves of the best performing indices for the diagnosis of β-thalassemia carrier status.

P value: Significance level of difference from an area of 0.5 (a non-informative diagnostic test).

Index	Area under the receiver<br>operating curve (AUC<br>under ROC)	P value	95% Confidence Interval for area under the curve
			Lower Bound	Upper Bound
Sirdah	0.830	< 0.001	0.749	0.911
Momani	0.830	< 0.001	0.747	0.913
Mentzer	0.827	< 0.001	0.746	0.909
Ehsani	0.825	< 0.001	0.742	0.908
RDWI	0.820	< 0.001	0.739	0.901
Green and King	0.815	< 0.001	0.733	0.896