Table 4.

Multiple logistic regression analysis for grade ≥ 2 RP (N = 100)

Predictor	Coefficient	SE	Odds ratio (95% CI)	p-value
Intercept	-6.1	1.7
SUV95a	0.40	0.13	1.5 (1.1-1.9)	<0.0027
Ageb	0.79	0.26	2.2 (1.3-3.7)	<0.0026
V30	0.09	0.034	1.1 (1–1.2)	<0.007

^aScaled by 10.

^bStandardized age was used with origin corresponding to the mean of 64.

Note: SE = standard error of the estimated coefficient parameter; CI = confidence interval for the odds ratio; Stepwise backward model selection based on Akaike information criterion was used; Symptomatic radiation pneumonitis was conditionally independent of tumor location, stage, histology, smoking status, MLD, and RT modality in the presence of SUV₉₅, V₃₀, and age; p-values derived from two-sided hypothesis tests using Wald chi-square; significant partial effects suggest that the odds of symptomatic radiation pneumonitis increased with SUV₉₅, V₃₀, and age; Nagelkerke coefficient of multiple determination R² = 0.32.