Table 6. Univariate analysis of dosimetric factors for freedom from cardiac events.

Factor	Median (range)	Subcategory	HR (95% CI)	P value
MHD (Gy)	13.1 (5.5–48.7)	≥13.1 vs. <13.1	3.59 (1.06–16.30)	0.04
Heart V5 (%)	49.4 (0–100)	≥49.4 vs. <49.4	6.69 (1.74–43.80)	0.005
Heart V10 (%)	39.4 (0–100.0)	≥39.4 vs. <39.4	6.13 (1.61–40.00)	0.008
Heart V15 (%)	31.0 (0–99.8)	≥31.0 vs. <31.0	6.08 (1.59–39.74)	0.009
Heart V20 (%)	22.7 (0–99.3)	≥22.7 vs. <22.7	2.23 (0.70–8.40)	0.18
Heart V25 (%)	18.3 (0–98.8)	≥18.3 vs. <18.3	3.26 (0.97–14.73)	0.06
Heart V30 (%)	15.6 (0–97.8)	≥15.6 vs. <15.6	2.16 (0.68–8.14)	0.20
Heart V35 (%)	11.8 (0–76.6)	≥11.8 vs. <11.8	2.29 (0.72–8.63)	0.17
Heart V40 (%)	9.1 (0–67.4)	≥9.1 vs. <9.1	2.29 (0.72–8.63)	0.17
Heart V45 (%)	6.8 (0–61.3)	≥6.8 vs. <6.88	1.50 (0.48–5.10)	0.48
Heart V50 (%)	5.3 (0–48.5)	≥5.3 vs. <5.3	1.57 (0.50–5.33)	0.44
Heart V55 (%)	3.5 (0–38.7)	≥3.5 vs. <3.5	1.67 (0.53–5.66)	0.38
Heart V60 (%)	1.9 (0–30.7)	≥1.9 vs. <1.9	1.58 (0.50–5.34)	0.43

MHD, mean heart dose; CI, confidence interval.