Table 6.

Receiver operating characteristics (ROC) analysis for G2 alopecia at 9 months after the end of radiotherapy.

Dosimetric variable	AUC	p-value for AUC	Cut-off	Sensitivity, %	Specificity, %	Incidence of G2 alopecia at 9 months		Fisher exact test p-value
						Low risk, %	High risk, %
D0.1cc	0.684	0.008	47.6 Gy	100.00	51.5	0.0%	17.4%	0.007
Mean dose	0.669	0.04	10.1 Gy	100.00	43.9	0.0%	14.0%	0.02
V30Gy	0.662	0.04	11.4 cc	100.00	39.4	0.0%	13.1%	0.04
V35Gy	0.710	0.001	9.3 cc	100.00	54.5	0.0%	17.4%	0.005
V40Gy	0.738	<0.0001	5.4 cc	100.00	63.64	0.0%	21.0%	0.0000
V43Gy	0.725	0.0002	2.2 cc	100.00	59.1	0.0%	19.5%	0.001

D_0.1cc, Dose to 0.1 cc of the scalp volume;V_xGy, percentage of the scalp volume receiving ≥ x Gy; AUC, area under curve at ROC analysis.

Bold text indicates statistical significance.