Metformin effect on internal carotid artery blood flow assessed by area under the curve of carotid artery Doppler in women with polycystic ovarian syndrome

Table 3 Best subset regression between homeostasis model assessment for insulin resistance as the main dependent variable vs carotid artery intima-media thickness, pulsatility indices, resistance indices and area under the curve of the carotid artery Doppler with calculation of associated Mallow’s coefficient

Variable	(Cp) Mallow’s coefficient
AUC-ICA	49.6
CIMT	155.5
PI	326.8
R1	637.0

AUC-ICA: Area under the curve for the internal carotid artery; CIMT: Carotid artery intima-media thickness; PI: Pulsatility indices; RI: Resistance indices.