Quantitative Methods 2017

EXAMPLE: predictive factor

The effect of the mean parotid dose on RTOG xerostomia grade 2 or more (1 year) depends on RT technique (unilateral versus bilateral RT)

0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%

Bilateral irradiation

NTCP (%)

Unilateral irradiation

0

10

20

30

40

50

60

70

Mean dose parotid glands

Source: Prospective Data Registration program UMCG